Male Reproductive

Male infertility: workup and management

Clinical Overview and When to Suspect Male Infertility

— Evaluate earlier if obvious male risk factors: known cryptorchidism, prior chemotherapy/radiation, testicular trauma, varicocele, anabolic steroid use, or prior infertility with another partner.

— Infertility affects ~15% of US couples; a male factor contributes in ~50% (sole cause in ~20–30%).

— Family/preventive medicine owns the initial workup, lifestyle counseling, and referral triage — fertility specialists do not do the first semen analysis order.

— High overlap with endocrine disease, occupational/toxin exposure, medication review, and chronic disease optimization — classic ambulatory longitudinal management.

— Anosmia (Kallmann), gynecomastia, small/firm testes (Klinefelter)

— History of mumps orchitis, undescended testes, herniorrhaphy, varicocele

— Erectile or ejaculatory dysfunction, retrograde ejaculation after prostate/bladder neck surgery

— Exogenous testosterone or anabolic steroid use — suppresses spermatogenesis (often reversible but takes months to years)

— Chronic opioids, sulfasalazine, cimetidine, ketoconazole, spironolactone, chemotherapy

— Reproductive and sexual history (frequency, timing, lubricants — many are spermicidal)

— Medical, surgical, medication, social history (tobacco, alcohol, marijuana, heat exposure, anabolic steroids)

— Focused GU exam

— Two semen analyses ≥2–3 weeks apart after 2–5 days of abstinence

Board pearl: If a couple presents at 8 months trying without conception and the female partner is 38, start the workup now — do not make them wait to hit 12 months.

Definition: Failure to achieve pregnancy after 12 months of regular, unprotected intercourse in a couple where the female partner is <35, or 6 months if female partner is ≥35 or has known risk factors (diminished ovarian reserve, prior pelvic surgery, irregular cycles).

Why Step 3 cares:

Always evaluate BOTH partners simultaneously. Do not delay female workup waiting on male results — a common Step 3 trap is sequential rather than parallel evaluation.

Red flags suggesting male factor up front:

Initial steps in any male presenting with infertility concern:

Presentation Patterns and Key History

— Reproductive history: Duration of attempted conception, coital frequency (optimal every 1–2 days around ovulation), timing relative to ovulation, use of lubricants (KY, Astroglide are spermatotoxic — recommend mineral oil, canola oil, or Pre-Seed), prior paternity with current or prior partner.

— Developmental: Timing of puberty (delayed puberty suggests hypogonadotropic hypogonadism), cryptorchidism and age of orchiopexy (later repair = worse spermatogenesis), gynecomastia.

— Surgical: Inguinal hernia repair (vas deferens injury), orchiopexy, varicocelectomy, prostate or bladder neck surgery (retrograde ejaculation), vasectomy, pelvic/retroperitoneal surgery (sympathetic injury → anejaculation).

— Medical: Diabetes (ejaculatory dysfunction, ED), cystic fibrosis or CBAVD, prior chemotherapy/radiation, mumps orchitis after puberty, testicular torsion, recurrent UTIs/STIs (epididymitis → obstruction), chronic systemic illness, thyroid disease, pituitary disease, sickle cell.

— Medications/exposures: Exogenous testosterone, anabolic steroids, finasteride, sulfasalazine, colchicine, chemotherapy, opioids, antipsychotics (hyperprolactinemia), SSRIs (ejaculatory delay), calcium channel blockers (sperm function), cimetidine, ketoconazole, spironolactone.

— Lifestyle: Tobacco, alcohol (>20 drinks/week), marijuana, cocaine, opioids; heat exposure (hot tubs, saunas, laptops, occupational); obesity; cycling >5 hr/week; anabolic supplement use.

— Sexual function: Erection quality, ejaculation (anejaculation, retrograde — cloudy first-void urine after orgasm), libido.

Step 3 management: A man on testosterone replacement trying to conceive — stop the testosterone, refer to fertility specialist for hCG ± FSH or clomiphene to restore intratesticular testosterone and spermatogenesis. Direct exogenous T is contraceptive.

Key distinction: Decreased libido + ED + low energy → suspect hypogonadism or hyperprolactinemia; normal libido with primary infertility → think obstructive or primary testicular cause.

Typical presentation: A couple presents to primary care concerned about inability to conceive. The male partner is usually asymptomatic — infertility itself is the chief complaint.

High-yield history domains (ask all of these):

Physical Exam Findings

— Body habitus, BMI (obesity → peripheral aromatization, ↓testosterone, ↑estradiol)

— Hair pattern, muscle mass, voice — eunuchoid proportions (arm span > height by >5 cm) suggests prepubertal hypogonadism (Klinefelter, Kallmann)

— Gynecomastia → estrogen excess, hCG-secreting tumor, Klinefelter, or anabolic steroid use

— Anosmia → Kallmann syndrome (test with coffee or alcohol pad)

— Visual field defects → pituitary mass

— Testicular volume: Normal adult ~15–25 mL (~4 × 3 cm) by Prader orchidometer. Small, firm testes (<6 mL) → Klinefelter; small, soft → hypogonadotropic hypogonadism; normal size with azoospermia → obstruction.

— Epididymis: Induration, cystic dilation, or absence suggests obstruction or CBAVD (congenital bilateral absence of vas deferens — palpate vas along spermatic cord).

— Vas deferens: Bilateral palpation mandatory. Nonpalpable vas → suspect CF mutation (test patient AND partner for CFTR).

— Varicocele: Dilated pampiniform plexus, "bag of worms" — examine standing, with and without Valsalva. Left-sided predominance (left gonadal vein drains into left renal vein at right angle). New right-sided or sudden left varicocele in older man → image kidneys for retroperitoneal mass/RCC.

— Penile abnormalities: hypospadias, severe chordee, Peyronie — may impair semen deposition.

Board pearl: A nonpalpable vas deferens is CBAVD until proven otherwise — order CFTR mutation testing on the patient and partner before any sperm retrieval, because offspring risk for CF depends on partner carrier status.

CCS pearl: Document a standing varicocele exam with Valsalva; subclinical varicoceles found only on ultrasound are not repaired in infertility workup.

General/secondary sexual characteristics:

Genital exam (the high-yield piece):

DRE: Boggy/tender prostate (prostatitis), midline cystic mass (ejaculatory duct cyst causing obstruction).

Diagnostic Workup — Initial Labs and Semen Analysis

— Two samples, 2–3 weeks apart, after 2–5 days of abstinence, collected by masturbation into a sterile container, delivered to lab within 1 hour at body temperature.

— WHO 2021 lower reference limits (5th percentile of fertile men):

— Volume ≥1.4 mL

— pH ≥7.2

— Concentration ≥16 million/mL

— Total count ≥39 million/ejaculate

— Total motility ≥42% (progressive ≥30%)

— Normal morphology ≥4% (strict Kruger)

— Vitality ≥54%

— Azoospermia (no sperm) → centrifuge sample to confirm; then distinguish obstructive vs nonobstructive with FSH and testicular size.

— Oligospermia (<16 million/mL), asthenospermia (low motility), teratospermia (abnormal morphology) — often coexist.

— Low volume (<1.4 mL) + azoospermia → suspect ejaculatory duct obstruction, retrograde ejaculation, or CBAVD. Check post-ejaculatory urinalysis for sperm.

— Low volume + acidic + no fructose → seminal vesicle/ejaculatory duct problem (CBAVD or EDO).

— Morning total testosterone + FSH (first tier)

— If T low or abnormal: add LH, prolactin, free testosterone, estradiol, TSH

— Interpretation:

— ↑FSH, ↑LH, ↓T, small testes → primary testicular failure (hypergonadotropic hypogonadism)

— ↓FSH, ↓LH, ↓T → secondary (hypogonadotropic) hypogonadism — MRI pituitary, check prolactin, iron studies (hemochromatosis)

— Normal FSH + azoospermia + normal testes → likely obstructive

— ↑Prolactin → MRI pituitary

Step 3 management: Do not order testosterone replacement for a hypogonadal man who wants fertility — it suppresses spermatogenesis. Use clomiphene, hCG, or aromatase inhibitor instead, typically by urology/REI.

Board pearl: Post-ejaculatory urine with >10–15 sperm/HPF = retrograde ejaculation — common in diabetic neuropathy and post-TURP/bladder neck surgery.

Semen analysis (SA) is the cornerstone — order first, always.

Pattern recognition from SA:

Endocrine evaluation — order if: sperm concentration <10 million/mL, impaired sexual function, or exam suggests endocrinopathy.

Diagnostic Workup — Advanced and Confirmatory Studies

— Nonobstructive azoospermia or severe oligospermia (<5 million/mL):

— Karyotype → Klinefelter (47,XXY) — most common genetic cause of azoospermia (~14% of azoospermic men)

— Y-chromosome microdeletion (AZFa, AZFb, AZFc) — AZFc deletions may still allow sperm retrieval; AZFa/AZFb almost never do

— Congenital bilateral absence of vas deferens (CBAVD): CFTR mutation panel on patient AND partner — offspring CF risk depends on both

— Recurrent pregnancy loss with the same partner: karyotype both partners (balanced translocations)

— Confirms varicocele when exam equivocal (clinically palpable varicoceles, not subclinical, are repaired)

— Evaluates testicular masses (incidental tumors found in ~0.5% of infertile men — higher rate than general population)

— Assesses testicular volume objectively

— Low-volume azoospermia with palpable vas → look for ejaculatory duct obstruction, midline cyst, dilated seminal vesicles (>1.5 cm AP)

— Therapeutic: guides TURED (transurethral resection of ejaculatory ducts)

— Both diagnostic and therapeutic in azoospermia — distinguishes obstructive (normal spermatogenesis) from nonobstructive (Sertoli-cell-only, maturation arrest, hypospermatogenesis)

— Sperm retrieved (TESE/microTESE) can be used directly for ICSI

— Generally performed by urology, not primary care

— Sperm DNA fragmentation index — consider in unexplained infertility, recurrent IVF failure, or recurrent pregnancy loss

— Anti-sperm antibodies — after vasectomy reversal, testicular trauma, or infection

— Sperm function/HOS test — limited routine role

Key distinction: Obstructive azoospermia = normal testicular size, normal FSH, normal T, palpable vas (or absent in CBAVD) → sperm production intact, surgically retrievable. Nonobstructive azoospermia = small testes, ↑FSH → spermatogenic failure; microTESE may still find sperm in ~50%.

Board pearl: Klinefelter men can father biological children via microTESE + ICSI in ~40–50% of cases — counsel hopefully, refer to reproductive urology.

Genetic testing — indicated for:

Scrotal ultrasound with Doppler:

Transrectal ultrasound (TRUS):

Testicular biopsy:

Specialized semen testing (selective use):

Risk Stratification and First-Line Management Logic

— Normal SA × 2 + normal female workup → "unexplained infertility" → refer to reproductive endocrinology; consider empiric IUI ± ovulation induction, then IVF.

— Abnormal SA + identifiable correctable cause → treat the cause first (see below).

— Severe oligospermia or azoospermia → urology/reproductive urology referral for genetic testing, imaging, possible surgical sperm retrieval.

— Stop gonadotoxic medications when possible: exogenous testosterone (mandatory if attempting conception), anabolic steroids, opioids, sulfasalazine (switch to mesalamine), cimetidine, ketoconazole.

— Lifestyle: Smoking cessation, alcohol moderation (<14 drinks/wk), stop marijuana, weight loss if BMI >30, avoid hot tubs/saunas/laptops-on-lap, treat OSA.

— Optimize chronic disease: Glycemic control in diabetes, thyroid replacement, treat prolactinoma (cabergoline).

— Coital timing/lubricant counseling: Intercourse every 1–2 days in fertile window; use sperm-friendly lubricant or none.

— Clinically palpable varicocele + abnormal SA + infertility → varicocelectomy improves SA parameters in ~60–70%, pregnancy rates in ~30–40%

— Obstructive azoospermia → vasovasostomy (post-vasectomy) or vasoepididymostomy; alternative is sperm retrieval + ICSI

— Ejaculatory duct obstruction → TURED

— Retrograde ejaculation → sympathomimetics (pseudoephedrine, imipramine) or sperm retrieval from alkalinized urine

— IUI — mild-moderate male factor, total motile sperm count >5–10 million

— IVF — moderate male factor, failed IUI, female factors

— IVF + ICSI — severe male factor, surgical sperm retrieval, prior IVF fertilization failure

Step 3 management: A 32-year-old man on TRT for 2 years with azoospermia and infertility — stop TRT, refer to reproductive urology, expect spermatogenesis recovery in 6–24 months (sometimes longer), bridge with hCG ± SERM if needed.

Board pearl: Subclinical varicoceles (only seen on US) and varicoceles with normal SA are not repaired.

Step 3 algorithm after initial workup:

Correctable/modifiable causes — treat in primary care:

Surgically/procedurally correctable:

Assisted reproductive technology (ART) escalation ladder:

Pharmacotherapy — First-Line Regimens

— hCG 1,500–3,000 IU SC 2–3×/week — acts as LH analog, stimulates Leydig cells → intratesticular T → spermatogenesis. First-line.

— If no sperm at 6 months, add recombinant FSH (75–150 IU SC 3×/week) or hMG.

— Clomiphene citrate 25–50 mg PO daily or QOD — SERM, blocks hypothalamic estrogen feedback → ↑LH/FSH → ↑endogenous T and spermatogenesis. Useful in men with intact HPG axis and idiopathic low T. Off-label but widely used.

— Anastrozole 1 mg PO daily — aromatase inhibitor for obese men with low T/estradiol ratio (<10); reduces estrogen-driven gonadotropin suppression.

— Pseudoephedrine 60 mg PO QID × several days before collection, or imipramine 25–50 mg PO QHS — restores bladder neck closure via α-adrenergic tone.

— If pharmacotherapy fails → alkalinize urine (sodium bicarbonate) and retrieve sperm from post-orgasm urine for IUI/IVF.

— Antioxidants (vitamin C, E, CoQ10, zinc, selenium, l-carnitine) — modest improvement in SA parameters in some studies; no clear pregnancy benefit (MOXI trial: no improvement). Reasonable to offer; not mandatory.

— Avoid promising patients these will work.

— Exogenous testosterone (mandatory)

— Finasteride/dutasteride (variable effect; consider stop)

— Anabolic steroids

— High-dose opioids — transition to non-opioid pain regimen

— Sulfasalazine → switch to mesalamine

Board pearl: A man with low T who wants fertility should never receive testosterone gel/injection — use clomiphene or hCG to raise T while preserving (or restoring) spermatogenesis.

Hypogonadotropic hypogonadism (secondary): Goal = restore spermatogenesis, NOT just normalize serum T.

Hyperprolactinemia: Cabergoline 0.25–0.5 mg PO twice weekly, titrate to normalize prolactin; pituitary MRI to rule out macroadenoma.

Retrograde ejaculation:

Pyospermia/genital tract infection: Treat documented infection (doxycycline for Chlamydia/Ureaplasma, fluoroquinolone for chronic bacterial prostatitis ×4–6 weeks). Do not treat asymptomatic leukocytospermia with antibiotics reflexively.

Empiric/adjunctive therapies (weak evidence — counsel honestly):

Drugs to STOP/avoid:

Procedures and Surgical Management

— Indications: All three required — (1) palpable varicocele, (2) abnormal semen analysis, (3) infertility (or progressive testicular atrophy in adolescents).

— Microsurgical subinguinal varicocelectomy = gold standard (lowest recurrence ~1%, lowest hydrocele rate). Alternatives: laparoscopic, retroperitoneal (Palomo), percutaneous embolization.

— Outcomes: SA improves in ~60–70% at 3–6 months; spontaneous pregnancy in ~30–40% over 1–2 years.

— Best results when reversal done <10 years post-vasectomy (patency >90%, pregnancy ~50–70%); >15 years drops markedly.

— Alternative: TESE/PESA + ICSI — more expensive, requires female ART, but bypasses obstruction.

— Couples-based decision: factors include female age, cost, insurance, desire for multiple children.

— Obstructive azoospermia (normal spermatogenesis): PESA (percutaneous epididymal) or MESA (microsurgical epididymal) — high yield.

— Nonobstructive azoospermia: microTESE (microdissection testicular sperm extraction) — sperm found in ~40–60% overall, ~50% in Klinefelter, near 0% in complete AZFa/AZFb deletions.

— Retrieved sperm used immediately or cryopreserved for ICSI.

— For ejaculatory duct obstruction confirmed on TRUS (midline cyst or dilated SV).

— Improves SA in ~60%; complications include retrograde ejaculation, urinary reflux into ejaculatory ducts.

— Sperm cryopreservation BEFORE chemotherapy, radiation, gender-affirming hormone therapy, or planned vasectomy.

— Adolescent males pre-chemo: offer banking — Step 3 favorite ethical scenario.

CCS pearl: For a man with newly diagnosed testicular cancer or lymphoma who is starting chemo next week — order sperm cryopreservation BEFORE first cycle. Even one banked sample preserves future fertility. Document the offer in the chart even if declined.

Key distinction: Obstructive azoospermia → spermatogenesis is intact → PESA/MESA suffices. Nonobstructive → spermatogenesis failed → need microTESE to find rare foci of sperm.

Varicocelectomy:

Vasectomy reversal (vasovasostomy / vasoepididymostomy):

Surgical sperm retrieval (for azoospermia):

Transurethral resection of ejaculatory ducts (TURED):

Pre-fertility-treatment fertility preservation:

Special Populations — Older Men and Renal/Hepatic Impairment

— Modest decline in semen volume, motility, and morphology; concentration relatively preserved.

— Increased sperm DNA fragmentation → ↑miscarriage, ↓live-birth rates with IVF.

— Slightly increased offspring risk of autosomal dominant new mutations (achondroplasia, Apert, Marfan), autism spectrum, and schizophrenia — small absolute risks; counsel non-alarmingly.

— No upper age cutoff for paternity — but discuss realistic timelines and offer genetic counseling for couples >45/40.

— Multifactorial hypogonadism: uremic Leydig cell dysfunction, hyperprolactinemia (↓renal clearance), zinc deficiency, oxidative stress, secondary hyperparathyroidism.

— Pattern: low T, often ↑LH/FSH, ↑prolactin → impaired libido and spermatogenesis.

— Management: optimize dialysis adequacy, correct anemia (erythropoietin improves gonadal function), zinc replacement, cabergoline for hyperprolactinemia. Fertility may improve markedly after kidney transplant — counsel transplant candidates.

— Avoid testosterone if fertility desired; use clomiphene cautiously.

— Impaired estrogen metabolism → hyperestrogenism, gynecomastia, testicular atrophy, hypogonadism.

— Alcohol independently gonadotoxic — Leydig cell injury, ↓T, ↑aromatization.

— Spironolactone (commonly used for ascites) worsens gynecomastia and reduces fertility — substitute with eplerenone if feasible.

— Liver transplant often partially restores gonadal axis.

— Erectile dysfunction (vascular + autonomic), retrograde ejaculation (autonomic neuropathy), sperm DNA fragmentation from oxidative stress.

— Optimize glycemic control (A1c <7%), treat ED (PDE5 inhibitors), pseudoephedrine for retrograde ejaculation.

— Anejaculation common — managed with penile vibratory stimulation (T10 or above) or electroejaculation for IVF/IUI.

Step 3 management: A 58-year-old man in a second marriage seeking fertility with normal SA and normal female workup — counsel that paternal age modestly lowers fertility per cycle, recommend prompt referral if no conception at 6 months, offer genetic counseling if pregnancy achieved.

Board pearl: Hyperprolactinemia in CKD is from decreased renal clearance, not adenoma — but still get MRI if prolactin is markedly elevated (>100 ng/mL) or sustained.

Advanced paternal age (≥40–45):

Chronic kidney disease / dialysis:

Cirrhosis / hepatic impairment:

Diabetes mellitus:

Spinal cord injury:

Special Populations — Adolescents, Cancer Survivors, Transgender Patients

— Orchiopexy by 6–18 months of age — earlier repair preserves spermatogenesis and reduces (but does not eliminate) testicular cancer risk.

— Bilateral cryptorchidism → higher infertility risk (~50% azoospermia if untreated; ~25% even with timely repair).

— Counsel adolescent males with history of cryptorchidism about future semen analysis in early adulthood if concerns.

— Repair if testicular volume differential >20%, abnormal SA in older adolescent, pain, or bilateral disease. Otherwise observe with annual exams and serial testicular volumes.

— Sperm banking BEFORE treatment — alkylating agents (cyclophosphamide, busulfan, procarbazine), testicular/pelvic radiation, TBI, and BMT conditioning regimens cause prolonged or permanent azoospermia.

— Recovery of spermatogenesis depends on regimen and cumulative dose; some recover in 1–4 years, many never.

— All postpubertal males starting gonadotoxic therapy must be offered sperm banking — ASCO and AAP guideline-level recommendation.

— Prepubertal boys: Experimental testicular tissue cryopreservation at specialized centers.

— Counsel early — sperm yield from microTESE declines after late adolescence/early 20s. Some centers offer early sperm banking in postpubertal Klinefelter teens.

— Lifelong endocrinology follow-up for testosterone replacement (after family complete) and metabolic risk.

— Hormone therapy causes progressive spermatogenic suppression, often permanent after prolonged use.

— Offer sperm cryopreservation BEFORE initiating gender-affirming hormones — fundamental informed consent element. Document discussion.

— Some restore spermatogenesis after stopping hormones; not guaranteed.

— Common in young men presenting with azoospermia. Counsel cessation; recovery takes 6–24 months, sometimes longer or never. Adjuncts: hCG + clomiphene to restart axis.

Board pearl: Failure to offer fertility preservation counseling before chemotherapy or gender-affirming hormones is a recurring Step 3 patient-safety/ethics violation. Document the offer in every chart.

Key distinction: Postpubertal mumps → orchitis → infertility. Prepubertal mumps does NOT cause infertility.

Adolescents with cryptorchidism:

Adolescent varicocele:

Cancer survivors (oncofertility):

Klinefelter syndrome (47,XXY):

Transgender women on estrogen / GnRH agonists:

Men using anabolic-androgenic steroids:

Complications and Adverse Outcomes

— Infertility is associated with rates of anxiety and depression comparable to cancer or cardiac disease. Men often underreport distress and feel stigmatized.

— Screen with PHQ-9 and GAD-7; offer counseling referral. Couples therapy improves outcomes and treatment adherence.

— Increased relationship strain and divorce risk during prolonged ART cycles.

— Varicocelectomy: Hydrocele (~3–7% open; <1% microsurgical), recurrence (~1–10% depending on technique), testicular artery injury (rare with microsurgery), persistent pain.

— Vasectomy reversal: Failure of patency, sperm granuloma, scrotal hematoma.

— TESE/microTESE: Testicular hematoma, transient testosterone decline, risk of permanent hypogonadism after repeated procedures.

— TURED: Retrograde ejaculation, urinary reflux into ejaculatory ducts/seminal vesicles → recurrent epididymitis.

— hCG/clomiphene: Gynecomastia, mood changes, visual disturbances (clomiphene), acne, polycythemia (hCG/T).

— OHSS affects female partner, not male — but couples-counseling responsibility.

— Multiple gestation with IUI/IVF — preterm delivery, low birth weight.

— ICSI bypasses natural sperm selection — small ↑risk of imprinting disorders (Angelman, Beckwith-Wiedemann), hypospadias in offspring, transmission of male infertility (Y deletions to sons).

— Higher prevalence of testicular cancer (~2-fold) — perform testicular self-exam education and exam.

— Increased cardiovascular and metabolic disease risk, lower overall life expectancy in severe male-factor infertility — male infertility may be a biomarker of overall health.

— Higher rate of incidental medical diagnoses on workup (testicular masses, hypothyroidism, diabetes).

Board pearl: A man with azoospermia or severe oligospermia has ~20-fold higher risk of being diagnosed with testicular cancer than a fertile man — scrotal ultrasound is reasonable as part of workup, and any palpable testicular mass requires immediate ultrasound and urology referral.

Step 3 management: Don't treat the semen analysis in isolation — use the infertility encounter as a preventive health touchpoint (BP, lipids, A1c, depression screening, STI screening, age-appropriate cancer screening).

Psychological impact:

Treatment-related complications:

ART-related:

Long-term health associations of infertile men:

When to Escalate Care — Referrals and Inpatient Triage

— Initial counseling and history/exam

— First two semen analyses

— Basic endocrine workup (testosterone, FSH, prolactin, TSH)

— Lifestyle counseling and medication optimization

— Stopping exogenous testosterone and counseling on recovery timeline

— Screening labs and preventive health

— Azoospermia or severe oligospermia (<5 million/mL) on confirmed SA

— Clinically palpable varicocele with abnormal SA and infertility

— Hypogonadism in a man seeking fertility (do not start TRT)

— Suspected obstruction: CBAVD, prior vasectomy, post-inguinal surgery

— Retrograde ejaculation or anejaculation

— Suspected genetic cause — Klinefelter, Y microdeletion, CFTR

— Testicular mass found on exam or US — urgent urology referral

— Couples desiring fertility preservation before chemo/radiation/gender-affirming care — urgent (cannot delay cancer therapy long, but most regimens can wait 1–2 days for banking)

— Female partner factors identified, or both partners need joint evaluation

— Couple has unexplained infertility and considering IUI/IVF

— Need for ICSI with surgically retrieved sperm

— Pituitary mass on MRI

— Suspected adrenal or thyroid disease driving infertility

— Hemochromatosis or other systemic endocrinopathy

— Any abnormal karyotype, Y microdeletion, or CFTR mutation

— Family history of CF, recurrent pregnancy loss, balanced translocations

— Advanced paternal age (≥45) at couple's request

— Significant depression, anxiety, or relationship distress

— Financial counseling for ART (often not covered by insurance; varies by state mandate — currently ~20 US states have some infertility coverage requirement)

CCS pearl: No truly "inpatient" triage for infertility itself — but never delay cancer chemotherapy for sperm banking beyond ~1–2 weeks; coordinate same-week banking with oncology. Document the multidisciplinary discussion.

Step 3 management: When in doubt with azoospermia → refer. Do not order testicular biopsy or initiate hormonal therapy from primary care.

Primary care can handle:

Refer to reproductive urology when:

Refer to reproductive endocrinology (REI) when:

Refer to medical endocrinology when:

Genetic counseling referral:

Mental health/social work referral:

Key Differentials — Same-Category (Male Reproductive) Causes

— Kallmann syndrome — congenital GnRH deficiency + anosmia; treat with pulsatile GnRH or hCG/FSH.

— Pituitary adenoma / prolactinoma — visual field defects, headache, ↑prolactin; treat with cabergoline ± surgery.

— Hemochromatosis — bronze skin, diabetes, cardiomyopathy + hypogonadism; check ferritin, transferrin saturation, HFE gene.

— Cushing syndrome, exogenous glucocorticoids — suppress HPG axis.

— Exogenous testosterone / anabolic steroids — most common iatrogenic cause in young men.

— Opioid-induced androgen deficiency — increasingly common; consider in chronic pain patients.

— Klinefelter syndrome (47,XXY) — small firm testes, gynecomastia, tall eunuchoid; most common genetic cause of azoospermia.

— Y-chromosome microdeletions (AZFa, AZFb, AZFc) — second most common genetic cause.

— Cryptorchidism (history of) — even after orchiopexy.

— Post-mumps orchitis (postpubertal), testicular torsion, trauma.

— Chemotherapy/radiation — alkylators worst.

— Varicocele — most common surgically correctable cause; mechanism = ↑scrotal temperature + oxidative stress.

— Sertoli-cell-only syndrome, maturation arrest — histologic patterns on biopsy.

— Idiopathic — large catch-all category.

— CBAVD — absent vas + CFTR mutations; test partner.

— Vasectomy — most common cause of obstructive azoospermia.

— Iatrogenic — herniorrhaphy, scrotal surgery.

— Ejaculatory duct obstruction — low-volume azoospermia, dilated SV on TRUS.

— Epididymal obstruction post-infection (gonorrhea, chlamydia, TB).

— Retrograde ejaculation — diabetes, post-TURP/bladder neck surgery, α-blockers, antipsychotics.

Key distinction: Use FSH + testicular size to rapidly triage azoospermia:

— ↑FSH + small testes = nonobstructive (testicular failure)

— Normal FSH + normal testes = obstructive

Board pearl: Anosmia + delayed puberty + infertility = Kallmann until proven otherwise — treatable cause of severe male infertility.

Pre-testicular (hypothalamic/pituitary — low FSH/LH/T):

Testicular (primary — high FSH, low T):

Post-testicular (obstruction — normal FSH, normal T, normal testes):

Key Differentials — Other-Category (Systemic and Non-Reproductive) Causes

— Diabetes mellitus — ED, retrograde ejaculation, sperm DNA damage; optimize A1c.

— Thyroid disease — both hyper- and hypothyroidism impair spermatogenesis; check TSH.

— Hyperprolactinemia — from prolactinoma, hypothyroidism, antipsychotics, chronic kidney disease; suppresses GnRH.

— Cushing syndrome — cortisol excess suppresses HPG axis.

— Adrenal disorders — late-onset congenital adrenal hyperplasia (rare).

— Erectile dysfunction — vascular, neurogenic, psychogenic, medication.

— Anejaculation — spinal cord injury, retroperitoneal lymph node dissection, autonomic neuropathy.

— Premature/delayed ejaculation — SSRIs delay ejaculation; antipsychotics cause anorgasmia.

— Inadequate coital frequency or timing — counsel every 1–2 days in fertile window.

— Sperm-toxic lubricants — replace with sperm-friendly products.

— Testosterone, anabolic steroids — suppress spermatogenesis

— Sulfasalazine — reversible oligospermia

— Cimetidine, spironolactone, ketoconazole — anti-androgen effects

— Finasteride/dutasteride — variable effect on SA

— Chemotherapy — alkylators worst

— Opioids — central suppression

— Antipsychotics — hyperprolactinemia

— Calcium channel blockers — sperm function (rare)

— Heat exposure — saunas, hot tubs, laptops, occupational (welders, bakers)

— Pesticides, heavy metals (lead, cadmium), solvents, radiation

— Tobacco, marijuana, cocaine, heavy alcohol

— Obesity — peripheral aromatization → estrogen excess → HPG suppression

— Obstructive sleep apnea — independent association with low T; treat with CPAP

— Always evaluate both partners in parallel — ovulatory dysfunction (PCOS), tubal disease, diminished ovarian reserve, endometriosis, uterine factors. ~30% of infertile couples have both male and female factors.

Step 3 management: A 41-year-old man on chronic opioids for back pain, BMI 36, with low T and oligospermia — taper opioids, treat OSA, address obesity. These three changes alone often restore fertility within 6–12 months.

Board pearl: Always review the full medication list and substance use in any infertility workup — most "idiopathic" cases have a contributor here.

Endocrine systemic:

Sexual/ejaculatory dysfunction (often missed):

Medications (high-yield list to recall):

Environmental/occupational/lifestyle:

Female factor mimics/coexists:

Long-Term Plan and Health Maintenance

— Smoking cessation — improves SA parameters within 3 months

— Alcohol <14 drinks/week

— Stop marijuana and recreational drugs

— Weight management — BMI 20–25 optimal; even 5–10% weight loss in obese men improves T and SA

— Regular moderate exercise — but avoid excessive endurance training and chronic cycling

— Avoid scrotal heat — saunas, hot tubs, prolonged laptop use, tight underwear

— Healthy diet — Mediterranean pattern associated with better SA; high processed-meat and trans-fat intake associated with worse parameters

— Antioxidant-rich foods (zinc, selenium, vitamins C/E, omega-3s) — modest evidence

— Reconcile for gonadotoxic agents; substitute where possible

— Document discussion of fertility impact before initiating new long-term meds in reproductive-age men

— Infertility is a marker of long-term health risk — increased CV disease, metabolic syndrome, testicular cancer

— Aggressively manage BP, lipids, glucose, BMI, tobacco

— Testicular self-exam monthly; physician exam annually

— Age-appropriate cancer screening (colon at 45, etc.) per USPSTF

— STI screening — many infertility patients have unrecognized chlamydia/gonorrhea

— Continue lifestyle changes — sperm quality matters for future pregnancies and offspring health

— Reassess hypogonadism after family complete → if symptomatic, can transition to TRT (now safe since fertility no longer desired)

— Counsel about genetic transmission of identified conditions to children

— Address grief and offer counseling

— Discuss donor sperm, adoption, gestational surrogacy as alternatives

— Continue managing identified medical conditions

Board pearl: Severe oligospermia or azoospermia is a vital sign of male health — men with male-factor infertility have higher all-cause mortality, more cardiovascular events, and earlier testicular cancer. The infertility visit is a preventive medicine opportunity.

Step 3 management: Once the family is complete in a hypogonadal man, reassess T levels and symptoms — if persistently low and symptomatic, testosterone replacement is now appropriate (and contraceptive, which is no longer a concern).

Lifestyle modifications (continuous, lifelong relevance):

Medication review at each visit:

Preventive health for the infertile man:

If treatment successful (pregnancy achieved):

If treatment unsuccessful:

Follow-Up, Monitoring, and Counseling

— Sperm cycle = ~74 days spermatogenesis + ~10–14 days transit → repeat SA at minimum 3 months after any intervention.

— After varicocelectomy: repeat at 3 and 6 months.

— After stopping exogenous testosterone: SA at 3, 6, 12 months; recovery may take 6–24+ months, sometimes never.

— After lifestyle modifications: 3–6 months.

— Before each IUI/IVF cycle: fresh SA per REI protocol.

— Clomiphene: Check T, estradiol, LH at 4–6 weeks; titrate dose. Monitor visual symptoms.

— hCG ± FSH: Monthly clinical assessment, T every 1–3 months, SA every 3–6 months. Watch for polycythemia (Hct), gynecomastia, acne.

— Cabergoline: Prolactin every 1–3 months until normalized; consider echocardiogram annually at higher doses (>2 mg/week) due to valvulopathy concern.

— Varicocelectomy: 2–4 week wound check, SA at 3 and 6 months.

— Vasectomy reversal: SA at 6 weeks, then every 2–3 months until pregnancy or 18 months.

— Realistic timeline — even with optimal treatment, conception often takes 6–24 months.

— Lifestyle changes take at least one full sperm cycle (~3 months) to manifest in SA.

— Coital timing: intercourse every 1–2 days throughout cycle, or every 1–2 days during the 6-day fertile window (5 days before ovulation + day of); ovulation predictor kits useful.

— Avoid daily ejaculation if oligospermic (depletes count) and avoid >5-day abstinence (reduces motility) — 2–3 day abstinence is the sweet spot for SA collection.

— Acknowledge emotional toll; screen for depression/anxiety at each visit; offer mental health referral.

— Discuss financial planning — ART is expensive; check insurance, employer benefits, state mandates.

— Coordinate with female partner's OB/GYN or REI

— Joint counseling sessions improve outcomes and reduce dropout from treatment

CCS pearl: Schedule follow-up at intervals that match biology — don't repeat a semen analysis at 4 weeks after starting clomiphene; the sperm being ejaculated were made before treatment started. Wait 3 months.

Board pearl: The 2–5 day abstinence window for SA collection is the standard test condition — outside this, parameters are unreliable.

Semen analysis follow-up cadence:

Endocrine monitoring on hormonal therapy:

Surgical follow-up:

Patient counseling pearls:

Couples-based follow-up:

Ethical, Legal, and Patient Safety Considerations

— Before initiating chemotherapy, radiation, gonadotoxic medications, or gender-affirming hormone therapy, the standard of care is to offer sperm cryopreservation and document the discussion.

— Failure to offer is a recurring source of litigation and a Step 3 ethics question. Even if the patient declines, document the offer and refusal.

— For adolescents, involve both the adolescent and parents; adolescent assent is required and many state laws specifically protect adolescent reproductive autonomy.

— Disclose to couple that identified abnormalities (Klinefelter, Y microdeletion, CFTR mutations) may be transmitted to offspring, particularly via ICSI which bypasses natural selection.

— Y microdeletions are transmitted to all male offspring who will likely have similar infertility.

— CFTR partner testing is mandatory before sperm retrieval in CBAVD — failure to test the partner may produce a child with cystic fibrosis. This is a high-yield safety issue.

— Written advance directives for storage duration, disposition in case of death, divorce, or relationship dissolution.

— Posthumous reproduction is legally and ethically complex; varies by state.

— Infertility diagnoses, especially male factor, carry stigma. Maintain strict confidentiality — do not disclose to extended family without explicit consent.

— Workplace and insurance discrimination concerns with genetic diagnoses (GINA protections apply to employment and health insurance, NOT to life or long-term care insurance).

— Infertility itself is not reportable, but underlying causes may be — e.g., suspected anabolic steroid abuse in an adolescent does not trigger mandatory reporting unless evidence of abuse/coercion; counsel and document.

— Multiple specialists involved (PCP, urology, REI, endocrinology, genetics, mental health). Communication gaps are the most common patient-safety failure point.

— Maintain a primary "quarterback" — usually the PCP or REI — to coordinate.

— Medication reconciliation at every visit; explicitly review for inadvertent testosterone prescribing in a man seeking fertility (a documented harm event).

— ART access varies dramatically by state mandate, employer benefit, and income — discuss financial implications honestly.

Board pearl: A 17-year-old newly diagnosed with osteosarcoma starting high-dose methotrexate and ifosfamide — mandatory offer of sperm banking before first cycle, document discussion with patient AND parent, involve adolescent in decision. Skipping this step is a Step 3 negligence vignette.

Step 3 management: Always reconcile testosterone prescriptions in any reproductive-age man; inadvertent TRT continuation is a preventable cause of iatrogenic infertility.

Informed consent for fertility preservation:

Genetic testing counseling:

Disposition of cryopreserved sperm:

Confidentiality:

Mandatory reporting:

Transition-of-care risk:

Cost and equity:

High-Yield Associations and Rapid-Fire Facts

— AZFc — sperm often retrievable via microTESE

— AZFa, AZFb — sperm retrieval almost never successful

Board pearl: Anytime you see "small, firm testes + tall stature + gynecomastia + azoospermia" → think Klinefelter → order karyotype, then refer for microTESE.

Key distinction: Obstructive vs nonobstructive azoospermia = decided by FSH + testis size, not by additional fancy testing in primary care.

Most common cause of male infertility = idiopathic (~30–40%); most common identifiable correctable cause = varicocele.

Klinefelter (47,XXY) = most common genetic cause of azoospermia; small firm testes, gynecomastia, tall stature, ↑FSH/LH, ↓T.

Y-chromosome microdeletion = second most common genetic cause:

CBAVD ↔ CFTR mutations — test patient AND partner before any sperm retrieval.

Varicocele — left-sided predominance (left gonadal vein → left renal vein at right angle); isolated new right-sided varicocele in an older man → image abdomen for RCC or retroperitoneal mass.

Kallmann syndrome = hypogonadotropic hypogonadism + anosmia + delayed puberty; KAL1 gene.

Postpubertal mumps → orchitis → infertility (prepubertal mumps does NOT).

Exogenous testosterone = most common iatrogenic cause of azoospermia in young men. Do not give TRT to a man seeking fertility.

Sulfasalazine → reversible oligospermia; switch to mesalamine.

Sperm-friendly lubricants: mineral oil, canola oil, Pre-Seed. Spermicidal: KY, Astroglide, saliva.

Optimal abstinence for SA: 2–5 days.

Sperm cycle: ~74 days spermatogenesis + ~14 days transit → repeat SA in 3 months after any intervention.

WHO 2021 lower SA limits: Volume 1.4 mL, concentration 16 M/mL, total motility 42%, normal morphology 4%.

Coital timing: Every 1–2 days through fertile window (5 days before ovulation + ovulation day).

Hyperprolactinemia in infertility → cabergoline; MRI pituitary if prolactin markedly elevated.

Retrograde ejaculation in diabetic — pseudoephedrine or imipramine; if fails, retrieve sperm from alkalinized urine.

Adolescent varicocele repair indication — testicular volume differential >20% between sides.

Hot tub, sauna, laptop on lap, tight underwear — modifiable scrotal heat exposure.

Infertile men have ~2x higher testicular cancer risk — perform/teach testicular self-exam; scrotal US if any palpable mass.

ICSI — single sperm injected into oocyte; bypasses natural selection; mild ↑ in offspring imprinting disorders and inherited male infertility.

CFTR partner testing before ICSI in CBAVD = standard of care.

Cabergoline at high doses (>2 mg/wk) → cardiac valvulopathy; consider periodic echo.

Board Question Stem Patterns

Board pearl: The most common Step 3 trap = giving testosterone replacement to a hypogonadal man who wants children. The right answer is always clomiphene or hCG.

Step 3 management: When the question stem mentions BOTH partners — always evaluate both in parallel, not sequentially. "Wait and see" answers are almost always wrong.

"32-year-old man, normal libido, gym enthusiast, azoospermia, normal testes": → He's on anabolic steroids or TRT. Stop, refer, expect months-to-years recovery.

"28-year-old man, anosmia, no puberty, micropenis, azoospermia": → Kallmann syndrome. Treat with hCG ± FSH or pulsatile GnRH.

"19-year-old male, tall, long arms, small firm testes, gynecomastia, infertility": → Klinefelter (47,XXY). Order karyotype, refer for microTESE + ICSI.

"Couple infertile × 1 year, man with bilateral nonpalpable vasa": → CBAVD. Order CFTR testing on man AND partner before sperm retrieval.

"Diabetic man, normal libido and erections, low-volume ejaculate, cloudy first-void urine": → Retrograde ejaculation. Confirm with post-ejaculatory UA (>10–15 sperm/HPF). Treat pseudoephedrine or imipramine.

"Man 6 months post-vasectomy reversal, seeking pregnancy": → Repeat SA at 6 weeks, then q2–3 months × 18 months.

"15-year-old newly diagnosed Ewing sarcoma starting chemo next week": → Offer sperm cryopreservation BEFORE first cycle. Document.

"58-year-old man, second marriage, normal SA, female partner 32, trying 14 months": → Both partners evaluated; counsel on modest paternal age effect; if female workup normal → REI referral for IUI.

"Man with hypogonadal symptoms wanting fertility, low T, low LH/FSH": → Clomiphene (or hCG); do NOT prescribe testosterone.

"Left-sided 'bag of worms,' abnormal SA, infertility": → Varicocelectomy if all three present (palpable + abnormal SA + infertility). New isolated right varicocele in older man → image kidneys.

"Man on sulfasalazine for ulcerative colitis with new oligospermia": → Switch to mesalamine; SA improves in months.

"Azoospermia with normal FSH and normal testes": → Obstructive — TRUS for ejaculatory duct, scrotal US, consider PESA/MESA.

"Azoospermia with elevated FSH and small testes": → Nonobstructive — karyotype, Y microdeletion testing; refer for microTESE.

"Man on chronic opioids with low T and oligospermia": → Opioid-induced androgen deficiency; taper opioids, address pain alternatives.

"Couple presents at 8 months trying, female age 38": → Begin workup now — don't wait 12 months due to advanced female age.

"Postpubertal mumps 5 years ago, now azoospermia": → Post-mumps orchitis → testicular failure.

One-Line Recap

Male infertility evaluation begins with a thorough history, exam, and two semen analyses 2–3 weeks apart in any couple unable to conceive after 12 months (or 6 months if female partner ≥35), with parallel female workup; subsequent management is dictated by the FSH and testicular size pattern, removal of gonadotoxic exposures (especially exogenous testosterone), correction of palpable varicoceles, and timely referral to reproductive urology for azoospermia or genetic causes — never replace testosterone in a man seeking fertility.

— 2 semen analyses (2–5 day abstinence, 2–3 weeks apart, WHO 2021 references)

— Endocrine: AM testosterone + FSH first; add LH, prolactin, TSH if abnormal

— Genetics for severe oligo/azoospermia: karyotype, Y microdeletion; CFTR for CBAVD (test partner too)

— Imaging: scrotal US for equivocal varicocele; TRUS for low-volume azoospermia

— Modifiable: stop TRT/anabolics, switch sulfasalazine, taper opioids, weight loss, no hot tubs/saunas, sperm-friendly lubricants

— Hormonal: clomiphene or hCG (never TRT) for hypogonadism + fertility; cabergoline for hyperprolactinemia

— Surgical: microsurgical varicocelectomy for palpable varicocele + abnormal SA + infertility; microTESE + ICSI for nonobstructive azoospermia; vasectomy reversal vs PESA + ICSI based on time and couple factors

— Giving testosterone to a man wanting fertility

— Failing to offer sperm banking before chemo/radiation/gender-affirming hormones

— Sequential rather than parallel couple evaluation

— Missing CFTR partner testing in CBAVD

— Repeating SA at <3 months after intervention

Board pearl: When in doubt, stop the testosterone, order two semen analyses, check FSH and exam the testes — that single move solves a majority of Step 3 male infertility vignettes.

Workup essentials:

Treatment triage:

Step 3 traps to avoid:

Big picture: Male infertility is both a diagnosis and a vital sign — these men have elevated cardiovascular, metabolic, and testicular cancer risk and deserve comprehensive preventive care at every visit.