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Human Development & Aging

Age-appropriate screening (BP, lipid, cancer, osteoporosis)

Core Principle of Age-Appropriate Screening
🧷 Screening aims to detect disease in asymptomatic individuals when early intervention improves outcomes — the foundation is that earlier detection leads to better prognosis.
🧷 Effective screening requires: high disease prevalence in target population, available effective treatment, acceptable test characteristics (sensitivity/specificity), and favorable benefit-to-harm ratio.
🧷 Age-based recommendations balance disease incidence curves with life expectancy and competing mortality risks.
🧷 Board pearl: Screening guidelines change based on risk factors — family history, ethnicity, and comorbidities modify standard age cutoffs.
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Blood Pressure Screening Guidelines
📍 Adults ≥18 years: BP screening at every healthcare encounter or at least annually if normal (<120/80).
📍 Children ≥3 years: annual BP screening at well-child visits.
📍 Diagnosis requires elevated readings on ≥2 separate occasions using proper technique (correct cuff size, seated 5 minutes, arm at heart level).
📍 Stage 1 HTN: 130-139/80-89; Stage 2 HTN: ≥140/90.
📍 Board distinction: Screening detects HTN, but diagnosis requires confirmation — a single elevated reading is insufficient for diagnosis or treatment initiation.
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Lipid Screening Across the Lifespan
🔹 Universal pediatric screening: ages 9-11 and 17-21 (catch familial hypercholesterolemia).
🔹 Adults 20-39: screen if cardiovascular risk factors present.
🔹 Adults 40-75: universal screening to calculate 10-year ASCVD risk.
🔹 Adults >75: individualized based on life expectancy and functional status.
🔹 Fasting not required for initial screening — non-HDL cholesterol and apoB are valid non-fasting.
🔹 Board pearl: Familial hypercholesterolemia (LDL >190) warrants immediate statin therapy regardless of calculated risk.
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Breast Cancer Screening Controversies
⭐ Mammography starting age varies by organization: USPSTF says 50, ACS says 45, ACOG says offer at 40.
⭐ Ages 50-74: biennial mammography has strongest evidence (USPSTF Grade B).
⭐ Ages 40-49: shared decision-making based on individual risk/benefit (USPSTF Grade C).
⭐ Clinical breast exam: no proven mortality benefit when added to mammography.
⭐ Board clue: Dense breast tissue reduces mammography sensitivity — supplemental ultrasound or MRI may be indicated.
⭐ BRCA carriers: annual MRI starting age 25-30 plus mammography starting age 30.
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Cervical Cancer Screening Evolution
✅ Age 21-29: cytology alone every 3 years (HPV testing not recommended due to high transient infection rate).
✅ Age 30-65: co-testing (cytology + HPV) every 5 years OR cytology alone every 3 years.
✅ No screening <21 years regardless of sexual activity — harms exceed benefits.
✅ No screening >65 if adequate prior screening and not high risk.
✅ Board pearl: HIV+ and immunosuppressed women need annual screening.
✅ Post-hysterectomy with cervix removal: no screening unless history of CIN2+ or cervical cancer.
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Colorectal Cancer Screening Options
🧠 Average risk screening starts age 45 (lowered from 50 due to rising young-onset CRC).
🧠 Options: colonoscopy q10 years, annual FIT, FIT-DNA q3 years, flexible sigmoidoscopy q5 years, CT colonography q5 years.
🧠 High-risk groups start earlier: family history of CRC <60 or advanced adenoma → start at 40 or 10 years before youngest affected relative.
🧠 Board distinction: Positive non-colonoscopy test → diagnostic colonoscopy required (not screening).
🧠 IBD patients: colonoscopy beginning 8 years after diagnosis with surveillance based on findings.
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Lung Cancer Screening Criteria
⚡ Annual low-dose CT for ages 50-80 with 20 pack-year history AND current smoker or quit within 15 years.
⚡ Discontinue when >15 years quit, life expectancy <10 years, or inability to undergo curative surgery.
⚡ Number needed to screen to prevent one death: ~320 (comparable to mammography).
⚡ Board pearl: Incidental nodules are common (~25%) — Lung-RADS classification guides follow-up.
⚡ Shared decision-making required due to false positive rate, radiation exposure, and overdiagnosis risk.
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Prostate Cancer Screening Debate
📌 PSA screening remains controversial due to overdiagnosis and overtreatment of indolent cancers.
📌 Age 55-69: shared decision-making about PSA screening (USPSTF Grade C).
📌 Age ≥70 or life expectancy <10 years: recommend against screening.
📌 African American men and those with family history: consider starting at age 45.
📌 Board clue: PSA can be elevated by prostatitis, BPH, recent ejaculation, or prostate manipulation — not specific for cancer.
📌 Digital rectal exam alone is insufficient for screening.
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Osteoporosis Screening and FRAX
📣 Women ≥65 years: universal bone density screening (DXA scan).
📣 Women <65: screen if 10-year fracture risk equals that of 65-year-old (FRAX score ≥9.3%).
📣 Men ≥70 or men 50-69 with risk factors (prior fracture, glucocorticoid use, hypogonadism).
📣 T-score interpretation: ≥-1.0 normal, -1.0 to -2.5 osteopenia, ≤-2.5 osteoporosis.
📣 Board pearl: Z-score compares to age-matched controls — used in premenopausal women and men <50.
📣 Screening interval: 2 years for osteopenia, longer if normal initial scan.
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Diabetes Screening Thresholds
🔸 Adults ≥35 years: universal screening regardless of risk factors (ADA 2022 update).
🔸 Any age with BMI ≥25 (≥23 in Asians) plus one risk factor: family history, high-risk ethnicity, PCOS, physical inactivity.
🔸 Women with gestational diabetes: lifelong screening every 3 years.
🔸 Prediabetes (A1c 5.7-6.4%, FPG 100-125, OGTT 140-199): annual screening.
🔸 Board distinction: Screening tests are fasting glucose, A1c, or OGTT — all are acceptable.
🔸 Children: screen if BMI ≥85th percentile plus two risk factors starting at age 10 or puberty.
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Abdominal Aortic Aneurysm Screening
🧷 One-time ultrasound screening for men aged 65-75 who have ever smoked (≥100 lifetime cigarettes).
🧷 Consider screening men 65-75 who never smoked based on family history and individual risk.
🧷 Women who have smoked: insufficient evidence, but consider if strong family history.
🧷 Board pearl: Aneurysm ≥5.5 cm or growing >0.5 cm/year → refer for repair.
🧷 Follow-up surveillance: 3.0-3.9 cm every 3 years, 4.0-5.4 cm annually.
🧷 Risk factors: smoking (strongest), male sex, age, family history, atherosclerosis.
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Hepatitis Screening Populations
📍 HCV: one-time screening for all adults 18-79 regardless of risk (major guideline change).
📍 HBV: screen high-risk groups — IV drug users, MSM, HIV+, household contacts of HBV+, hemodialysis, elevated ALT, pregnant women.
📍 Born in HBV-endemic areas (Asia, Africa, Pacific Islands): screen regardless of vaccination status.
📍 Board clue: HCV screening uses antibody test → if positive, confirm with HCV RNA.
📍 HBV screening includes HBsAg and anti-HBs (anti-HBc if from endemic area).
📍 Pregnant women: universal HBV screening, HCV if risk factors.
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HIV Screening Recommendations
🔹 Universal opt-out screening for all patients aged 13-64 at least once.
🔹 Annual screening for high-risk groups: MSM, IV drug users, sexually active with HIV+ partner.
🔹 Pregnant women: screen at first prenatal visit, retest in third trimester if high risk.
🔹 Fourth-generation combination antigen/antibody test detects infection earlier than antibody alone.
🔹 Board pearl: Acute HIV may present with negative antibody but positive viral load — consider in mononucleosis-like illness with risk factors.
🔹 PrEP candidates need baseline HIV testing plus regular monitoring.
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Skin Cancer Screening Approach
⭐ USPSTF: insufficient evidence for routine total body skin exams in average-risk adults.
⭐ High-risk patients benefit from screening: personal history of skin cancer, family history of melanoma, >50 nevi, atypical nevi, immunosuppression.
⭐ ABCDE criteria: Asymmetry, Border irregularity, Color variation, Diameter >6mm, Evolution.
⭐ Board distinction: Melanoma can arise de novo (70%) or from existing nevi (30%).
⭐ Dermoscopy by trained providers increases diagnostic accuracy.
⭐ Patient self-examination monthly with annual clinical exams for high-risk individuals.
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Thyroid Disease Screening
✅ No routine TSH screening in asymptomatic adults (USPSTF recommendation).
✅ Consider screening in high-risk groups: women >60, family history, autoimmune disease, Down syndrome, Turner syndrome.
✅ Pregnancy: universal TSH screening at first prenatal visit if symptomatic or risk factors.
✅ Subclinical hypothyroidism (elevated TSH, normal T4): found in 4-8% of adults, treatment controversial.
✅ Board pearl: Lithium, amiodarone, and radiation exposure warrant periodic thyroid monitoring.
✅ Neck radiation in childhood: annual thyroid palpation starting 5 years post-exposure.
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Depression and Anxiety Screening
🧠 Adults: screen for depression in settings with adequate support systems for diagnosis and treatment.
🧠 Adolescents 12-18: screen for major depressive disorder annually.
🧠 Pregnant and postpartum women: screen during pregnancy and postpartum period.
🧠 Common tools: PHQ-2 (initial), PHQ-9 (follow-up), Edinburgh Postnatal Depression Scale.
🧠 Board distinction: Positive screen requires clinical interview for diagnosis — screening tools alone don't diagnose.
🧠 Elderly: use Geriatric Depression Scale (yes/no format easier for cognitive impairment).
🧠 Anxiety screening gaining support but not yet universally recommended.
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Sexually Transmitted Infection Screening
⚡ Chlamydia/gonorrhea: annual screening for sexually active women ≤24, older women with risk factors, MSM.
⚡ Syphilis: screen pregnant women, MSM, HIV+, commercial sex workers.
⚡ Pregnancy STI panel: HIV, HBV, syphilis, chlamydia/gonorrhea if <25 or risk factors.
⚡ Board pearl: Nucleic acid amplification tests (NAAT) preferred for chlamydia/gonorrhea — can use urine, cervical, vaginal, pharyngeal, rectal specimens.
⚡ Expedited partner therapy: prescribe treatment for partners without examination (legal in most states).
⚡ Three-site testing (pharynx, rectum, urine/genital) for MSM given varied sexual practices.
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Vision and Hearing Screening
📌 Newborns: red reflex exam to detect cataracts, universal hearing screening before discharge.
📌 Children: vision screening at 3, 4, 5 years then annually; formal audiometry if failed screening.
📌 Adults 18-39: comprehensive eye exam based on risk factors.
📌 Adults ≥65: annual eye exams for glaucoma, macular degeneration, cataracts.
📌 Board clue: Amblyopia screening critical before age 5 — after this, vision loss may be permanent.
📌 Diabetics: dilated eye exam within 5 years of type 1 diagnosis, at type 2 diagnosis, then annually.
📌 Hearing loss in elderly associated with cognitive decline, depression, falls.
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Board Question Stem Patterns
📣 52-year-old woman asks about mammography → discuss shared decision-making for ages 40-49.
📣 28-year-old woman with ASCUS Pap → HPV testing determines colposcopy need.
📣 45-year-old man with 25 pack-year smoking history → too young for lung cancer screening (start at 50).
📣 68-year-old woman never screened for osteoporosis → order DXA scan.
📣 22-year-old sexually active woman → annual chlamydia screening indicated.
📣 40-year-old with BMI 28 and family history of diabetes → screen now, don't wait until 45.
📣 One-time positive BP reading of 142/88 → recheck before diagnosing hypertension.
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One-Line Recap
🔸 Age-appropriate screening balances disease prevalence, test characteristics, and life expectancy across the lifespan — from universal newborn hearing screening through risk-stratified cancer screening in adults — with guidelines evolving based on epidemiologic trends, requiring clinicians to individualize recommendations using shared decision-making for controversial screens while maintaining population health through evidence-based protocols.
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