Pediatrics (System-Integrated)

Pediatric iron deficiency anemia: screening and management

Clinical Overview and When to Suspect Iron Deficiency Anemia

— Iron depletion (low ferritin, normal Hb)

— Iron-deficient erythropoiesis (low transferrin saturation, elevated RDW)

— Frank IDA (microcytic, hypochromic anemia with low MCV/Hb)

— Toddler 12–24 mo drinking >24 oz/day cow's milk (impairs absorption, occult GI blood loss, displaces iron-rich foods)

— Exclusively breastfed infant >6 months without iron supplementation or iron-fortified foods

— Preterm/low birth weight infant beyond 2–4 months (depleted stores)

— Adolescent girl with heavy menses, vegetarian diet, or athletic training

— Pica (ice, dirt, paper), restless legs, breath-holding spells, developmental delay, school underperformance

— Recent immigrant, food insecurity, lead exposure (often coexists)

Board pearl: USPSTF gives an I statement (insufficient evidence) for universal screening, but AAP/Bright Futures recommends universal Hb screening at 12 months plus selective screening of high-risk children at any age — Step 3 follows AAP for pediatric primary care.

Iron deficiency anemia (IDA) is the most common nutritional deficiency in US children, with peak prevalence at 9–24 months and again in adolescent menstruating females.

Iron is required for hemoglobin synthesis, myelination, and neurotransmitter function — deficiency in the first 1000 days can produce irreversible neurocognitive deficits even without overt anemia.

Pathophysiology spectrum (sequential):

When to suspect in a Step 3 stem:

Risk factor mnemonic — "MILK-PIE": Milk excess, Inadequate complementary feeding, Low birth weight, Kid menstruating, Pica, Inflammatory bowel/celiac, Eating disorder.

Clinical impact: untreated IDA in infancy → lower IQ scores, attention deficits, impaired social-emotional development — primary prevention via dietary counseling is the highest-yield intervention.

Presentation Patterns and Key History

— Pallor (only visible when Hb <7–8 g/dL; check conjunctivae, palms, nail beds)

— Fatigue, irritability, poor feeding, decreased exercise tolerance

— Pica — craving ice (pagophagia), dirt, paint chips, paper, starch; resolves with iron repletion

— Restless legs syndrome and disrupted sleep

— Breath-holding spells in toddlers — treating IDA reduces frequency

— Developmental regression or delay, poor school performance

— Tachycardia, exertional dyspnea, flow murmur in severe cases

— Koilonychia (rare in kids), angular cheilitis, glossitis (uncommon)

— Cow's milk volume per day — >24 oz strongly suggests IDA in toddlers

— Age cow's milk introduced (should be ≥12 months)

— Breastfeeding duration, iron-fortified formula use, iron-fortified cereal start (~6 mo)

— Vegetarian/vegan, food insecurity, WIC enrollment

— Adolescents: menstrual history (duration, pad count, clots), athletic training, eating disorders

— Prematurity, low birth weight, twin gestation, maternal IDA

— GI symptoms: chronic diarrhea (celiac, IBD), reflux, hematochezia, melena

— Recurrent epistaxis, easy bruising

— Lead exposure (old housing pre-1978, paint chips, imported pottery)

— Recent infection (anemia of inflammation differential)

Step 3 management: A 15-month-old drinking 32 oz of whole milk daily with Hb 9.5 and MCV 65 — diagnose IDA empirically, limit milk to <20 oz/day, start oral ferrous sulfate 3–6 mg/kg/day elemental iron, and recheck Hb in 4 weeks. Do not order endoscopy or extensive workup first-line in classic milk-driven cases.

Most children with mild-to-moderate IDA are asymptomatic — detection is usually via routine screening or incidental CBC.

Symptomatic presentations:

Key dietary history (the highest-yield Step 3 question):

Birth and medical history:

Family history: thalassemia trait (Mediterranean, African, SE Asian ancestry), hereditary spherocytosis — alters differential.

Physical Exam Findings and Hemodynamic Assessment

— Resting tachycardia is the earliest cardiovascular sign

— Tachypnea and widened pulse pressure with severe anemia

— Hypotension is late — suggests acute blood loss, not chronic IDA

— Document growth parameters; failure to thrive raises suspicion of malabsorption (celiac, IBD)

— Conjunctival pallor (most reliable mucous membrane sign in children)

— Angular cheilitis, atrophic glossitis, pale tongue

— Sclera should be white — scleral icterus suggests hemolysis, not IDA

— Systolic flow murmur (high-output state) — disappears with treatment

— Gallop or signs of high-output heart failure only in profound anemia (Hb <4–5)

— Pallor of palms and nail beds

— Koilonychia (spoon nails) — uncommon, advanced disease

— No jaundice (vs hemolysis), no petechiae (vs marrow failure/ITP)

— Splenomegaly is NOT typical of IDA — its presence redirects toward thalassemia, hemolysis, malignancy, or portal hypertension

— Hepatomegaly likewise atypical

— Assess milestones, attention, tone — chronic IDA correlates with cognitive delay

— Restless legs signs, sleep history

Key distinction: IDA → pale, tachycardic, no splenomegaly, no jaundice. Thalassemia major → pallor + splenomegaly + frontal bossing + maxillary overgrowth. Hemolytic anemia → pallor + jaundice + splenomegaly. Exam alone narrows the differential before labs.

— Petechiae, purpura, bone pain, lymphadenopathy → leukemia

— Severe pallor with hemodynamic instability → acute hemorrhage; obtain type and screen, IV access, transfuse

— Heart failure signs in chronic severe anemia → admit, transfuse slowly (5 mL/kg over 4 hr with furosemide) to avoid pulmonary edema.

Most children appear well; targeted exam focuses on severity and ruling out alternative diagnoses.

Vital signs and hemodynamics:

HEENT:

Cardiac:

Skin/nails:

Abdomen:

Neurodevelopmental:

Red flag exam findings prompting urgent workup:

Diagnostic Workup — Initial Labs

— Some practices add ferritin to the 12-month screen given its added sensitivity

— Low Hb (age-specific cutoffs — Hb <11 g/dL at 12 mo–5 yr; <11.5 at 5–12 yr; <12 in adolescent girls; <13 in adolescent boys)

— Microcytic (low MCV, age-specific; rough rule: MCV lower limit ≈ 70 + age in years up to 80)

— Hypochromic (low MCH, MCHC)

— High RDW (>14.5%) — key differentiator from thalassemia

— Reticulocyte count low or inappropriately normal

— Platelets often mildly elevated (reactive thrombocytosis) — classic IDA clue

— Low ferritin (<15 ng/mL diagnostic; <30 supportive) — most specific single test

— Low serum iron, high TIBC, low transferrin saturation (<16%)

— Elevated soluble transferrin receptor

— Ferritin is an acute-phase reactant — may be falsely normal with infection/inflammation; check CRP if concerned

— Lead level in toddlers with IDA — co-occurrence common; lead inhibits heme synthesis

— Stool guaiac if GI loss suspected

— Reticulocyte hemoglobin content (CHr) — early marker, available at some centers

Board pearl: Mentzer index (MCV ÷ RBC count) — >13 suggests IDA, <13 suggests thalassemia trait. In IDA the RBC count is low; in thalassemia trait, RBC count is normal-to-high with disproportionately low MCV.

AAP screening recommendation: universal Hb (or Hct) at 12 months, plus risk-assessment-driven screening at 4, 15, 18, 24, 30 months and annually thereafter for high-risk children.

CBC findings in IDA:

Iron studies (when diagnosis unclear or confirmation needed):

Adjunctive in select cases:

Empiric trial of iron is acceptable in classic toddler IDA without invasive workup — response confirms diagnosis. Reticulocytosis appears in 5–7 days, Hb rises ~1 g/dL per 2–4 weeks.

Diagnostic Workup — Advanced or Confirmatory Studies

— Failure to respond to 4 weeks of adherent oral iron therapy

— Severe anemia (Hb <7), recurrent IDA, or atypical age (infant <6 mo, male adolescent)

— Coexisting GI symptoms, growth failure, or family history of GI disease

— Microcytosis with normal iron studies → evaluate for thalassemia

— Indicated when iron studies are normal or after iron repletion in a persistently microcytic child

— α-thalassemia trait may have normal HbA2 — diagnosed by exclusion or genetic testing

— β-thalassemia trait: elevated HbA2 (>3.5%) ± elevated HbF

— Order electrophoresis AFTER iron repletion — IDA can suppress HbA2 and mask β-thalassemia trait

— Tissue transglutaminase IgA + total IgA in refractory IDA, especially with GI symptoms, FTT, or family history — celiac is a leading cause of "iron-resistant" IDA

Step 3 management: A 3-year-old with IDA unresponsive to 8 weeks of oral iron, normal adherence — next step is celiac serology (tTG-IgA + total IgA) before escalating to endoscopy or IV iron.

Indications for advanced workup (i.e., when not a simple dietary-driven toddler case):

Hemoglobin electrophoresis / HPLC:

Celiac serology:

H. pylori testing: stool antigen in adolescents with refractory IDA

IBD workup: fecal calprotectin, ESR/CRP, albumin if chronic diarrhea, abdominal pain, weight loss

Stool studies: occult blood; ova and parasites if exposure (hookworm, whipworm)

Urinalysis: rare pulmonary/renal hemosiderosis

Meckel scan (Tc-99m pertechnetate) if painless GI bleeding in a young child

Endoscopy/colonoscopy: reserved for unexplained or refractory IDA with GI symptoms or positive stool blood

Bone marrow biopsy: rarely needed — only if pancytopenia or marrow failure suspected; absent stainable iron is gold standard but invasive

Document the cause; "treat empirically and never investigate" is a Step 3 trap in atypical presentations.

Risk Stratification and First-Line Management Logic

— Mild: Hb 10–11 (or age-specific lower limit)

— Moderate: Hb 7–10

— Severe: Hb <7 — symptomatic, may need transfusion if hemodynamically unstable

— Mild–moderate IDA, classic dietary etiology → empiric oral iron + dietary counseling, recheck Hb in 4 weeks

— Refractory after 4 weeks of adherent therapy → reassess adherence, dose, ongoing losses; pursue advanced workup

— Severe IDA with stable hemodynamics → oral iron, close follow-up, consider IV iron if rapid replenishment needed

— Severe IDA with heart failure, syncope, or hemodynamic instability → admit, slow PRBC transfusion (5 mL/kg over 4 hr) with diuretic; risk of transfusion-associated circulatory overload is high in chronic anemia

— Limit cow's milk to <20–24 oz/day in toddlers

— Iron-rich foods: meat, poultry, fish (heme iron, best absorbed), iron-fortified cereals, beans, lentils, leafy greens

— Pair non-heme iron with vitamin C (citrus, strawberries, peppers) to enhance absorption

— Avoid tea, calcium, antacids near iron doses

— Term breastfed infants: start iron 1 mg/kg/day at 4 months until iron-rich complementary foods introduced (AAP)

— Preterm/LBW breastfed infants: 2 mg/kg/day starting at 1 month through 12 months

— Iron-fortified formula if not breastfeeding

— Delay cow's milk until 12 months

CCS pearl: For an outpatient toddler with Hb 8.5 and milk-heavy diet — order CBC, ferritin, lead level; counsel on diet; prescribe ferrous sulfate 3 mg/kg/day elemental iron once daily; schedule follow-up CBC in 4 weeks; advance the clock and document response before pursuing further workup.

Step 3 management hinges on age, severity, etiology, and tolerance of oral iron.

Severity stratification (Hb-based):

Management algorithm:

Dietary counseling pillars:

Prevention:

Always co-screen for lead toxicity in young toddlers with IDA.

Pharmacotherapy — First-Line Iron Replacement

— Ferrous sulfate — 20% elemental iron; standard pediatric drops/elixir

— Ferrous gluconate — 12% elemental

— Ferrous fumarate — 33% elemental

— Iron polysaccharide complex — less GI upset, possibly less absorption

— Mild IDA: 3 mg/kg/day

— Moderate–severe: up to 6 mg/kg/day

— Adolescents: 60–120 mg elemental iron/day

— Traditional: divided BID–TID with meals to reduce GI side effects

— Newer evidence (including pediatric data): once-daily or every-other-day dosing may improve fractional absorption by minimizing hepcidin upregulation, with fewer side effects — increasingly endorsed

— Give on an empty stomach if tolerated; pair with vitamin C / orange juice

— Avoid co-administration with milk, calcium, antacids, tea, or PPIs (decrease absorption)

— Constipation, abdominal pain, nausea, dark/black stools (benign — distinguish from melena)

— Transient tooth staining with liquid — give with dropper to back of mouth, rinse after

— Iron overdose is a leading cause of pediatric poisoning death — keep out of reach, use child-proof caps

— Treat for total of 3 months after Hb normalizes to replete stores

— Set return visit at 4 weeks for CBC; expect Hb rise ≥1 g/dL

Board pearl: Failure to respond at 4 weeks → "3 A's": Adherence (most common), Absorption (celiac, H. pylori, PPI), Alternative diagnosis (thalassemia, anemia of inflammation, ongoing loss). Address in that order.

Oral iron is first-line for nearly all pediatric IDA.

Formulations and dosing (elemental iron):

Therapeutic dose: 3–6 mg/kg/day elemental iron, max 150–200 mg/day

Dosing strategy (evolving evidence):

Side effects:

Counseling:

Reticulocytosis by day 5–7 confirms response and supports diagnosis empirically.

Parenteral Iron and Transfusion

— Iron sucrose — well-studied in children, multiple infusions

— Ferric carboxymaltose — approved in children ≥1 year; total dose in 1–2 visits; watch for hypophosphatemia

— Ferumoxytol, iron dextran (low molecular weight) — alternatives; LMW iron dextran requires test dose

— Avoid older high-MW iron dextran (anaphylaxis risk)

— Hemodynamic instability, active hemorrhage

— Symptomatic severe anemia (Hb typically <7 with cardiopulmonary compromise)

— Pre-procedural urgency

— Chronic severe IDA: transfuse cautiously — 5 mL/kg over 4 hours, consider diuretic; risk of TACO and reperfusion pulmonary edema is high

— Avoid transfusion for chronic asymptomatic IDA — oral iron is preferred even if Hb is 5–6 if child is stable

Step 3 management: Adolescent with Crohn disease and Hb 7.5, ferritin 8, on infliximab — oral iron poorly absorbed and worsens GI symptoms. Order IV ferric carboxymaltose rather than escalating oral dose or transfusing.

— Treat underlying cause simultaneously (GI bleed control, menorrhagia management, celiac gluten-free diet, H. pylori eradication)

— Adolescent menorrhagia: consider combined OCPs or LNG-IUD for menstrual suppression alongside iron

— Postoperative anemia / pre-surgical optimization: IV iron can avoid transfusion exposure

IV iron is indicated when oral therapy fails despite adherence, in malabsorption (IBD, post-bariatric, severe celiac), intolerance, or when rapid repletion is needed (preoperative, severe symptoms).

Available agents in pediatrics:

Pre-medication: routine premedication not required; monitor for infusion reactions (flushing, hypotension, myalgia — "Fishbane reaction" — usually self-limited; slow infusion and resume)

Calculating total iron deficit (Ganzoni or manufacturer-specific equations) — most modern agents use fixed weight-based dosing

PRBC transfusion indications:

Co-management considerations:

Special Populations — Renal, Hepatic, and Chronic Disease

— IDA contributes to anemia of CKD alongside erythropoietin deficiency

— Pediatric KDIGO guidance: maintain ferritin >100 ng/mL and TSAT >20% before initiating ESA therapy

— IV iron preferred in CKD on dialysis; oral acceptable in non-dialysis CKD

— Treat iron deficiency first, then add erythropoiesis-stimulating agents (epoetin alfa, darbepoetin) targeting Hb 11–12 (avoid >13)

— Mixed IDA + anemia of inflammation; ferritin may be falsely normal — interpret with CRP

— Ferritin <30 in IBD = absolute iron deficiency; 30–100 with CRP elevated = functional deficiency

— Oral iron may worsen mucosal inflammation — IV iron is first-line in active IBD

— Up to one-third of pediatric celiac presents with IDA; some have IDA without GI symptoms

— Gluten-free diet alone often restores iron absorption — supplement until ferritin normalizes

— Iron deficiency worsens exercise capacity and outcomes — treat aggressively, often IV iron

— Cyanotic CHD: target higher Hb; "relative" anemia at Hb 12 may be inadequate

Key distinction: Anemia of chronic inflammation (high ferritin, low TIBC, low TSAT) vs IDA (low ferritin, high TIBC, low TSAT). Concurrent disease blurs the picture — use soluble transferrin receptor or sTfR/log ferritin index if ambiguous.

Chronic kidney disease (CKD):

Inflammatory bowel disease:

Celiac disease:

Heart failure / cyanotic congenital heart disease:

Hepatic disease: rarely alters iron dosing; rule out hemochromatosis if ferritin paradoxically elevated

Hospitalized / critically ill pediatric patients: avoid unnecessary phlebotomy (iatrogenic anemia is real); cluster blood draws; consider pediatric microsampling tubes — patient-safety priority.

Special Populations — Infants, Adolescents, and Pregnancy

— Iron stores accumulate in third trimester; preterms are born depleted

— Supplement 2 mg/kg/day elemental iron from 1 month through 12 months (breastfed or partially fed)

— Formula-fed preterms: iron-fortified preterm formula usually sufficient; some still need supplementation

— Breast milk iron is highly bioavailable but quantity insufficient after 4–6 months

— AAP: 1 mg/kg/day elemental iron starting at 4 months until adequate iron-rich solids

— Peak IDA period; cow's milk overuse is the dominant driver

— Limit cow's milk to <20–24 oz/day; avoid bottle propping/grazing

— Menstruating females: screen with Hb/ferritin annually if at risk

— Athletes ("athletic pseudoanemia" from plasma volume expansion is different from true IDA — check ferritin)

— Eating disorders, vegetarians/vegans: lower bioavailability of plant iron → higher requirement

— Heavy menstrual bleeding: evaluate for von Willebrand disease, PCOS, structural causes; consider hormonal suppression

— Iron requirements increase; 27 mg/day prenatal iron recommended

— Screen Hb at first prenatal visit and at 24–28 weeks

— Maternal IDA → low birth weight, preterm birth, infant IDA

— IV iron in 2nd/3rd trimester if severe or oral-intolerant

Board pearl: Cow's milk before 12 months is a Step 3 favorite — it causes microscopic GI blood loss, displaces iron-rich foods, and binds iron — triple mechanism for IDA. Reinforce this at every well-child visit.

Preterm and low-birth-weight infants:

Term breastfed infants:

Toddlers (1–3 years):

Adolescents:

Adolescent pregnancy:

Globally, hookworm is a major cause of pediatric IDA; ask about recent international travel/residence and consider empiric albendazole plus stool studies in returning travelers.

Complications and Adverse Outcomes

— IDA in the first 2 years is associated with lower cognitive scores, attention deficits, motor delays, and behavioral problems

— Some deficits persist despite iron repletion — emphasizing primary prevention

— Linked to school underachievement and reduced IQ at age 5–10

— High-output state, flow murmurs reversible with treatment

— Severe untreated anemia → high-output heart failure, especially in infants

— Transfusion in chronic IDA → TACO if given rapidly

— Breath-holding spells — IDA increases frequency; iron therapy reduces episodes

— Restless legs syndrome and sleep disturbance

— Increased risk of febrile seizures (controversial association)

— Mild iron deficiency may be protective against some infections; severe IDA impairs immune function

— Concerns about IV iron in active bacteremia — defer in active infection

— Lead poisoning from paint chips

— Bezoars, dental damage from ice

— Parasitic infection from soil ingestion (geophagia)

— IDA increases lead absorption; lead inhibits heme synthesis — vicious cycle

— Check venous blood lead in any toddler with IDA

Board pearl: A toddler with IDA + developmental delay + pica + lead level 25 — treat both iron deficiency (improves cognition, reduces further lead absorption) and lead exposure (environmental abatement, chelation if level ≥45). Don't pick one; the test rewards comprehensive answers.

Neurodevelopmental — the most important long-term harm:

Cardiovascular:

Behavioral:

Infectious:

Pica complications:

Co-occurring lead poisoning:

Pulmonary hemosiderosis (rare): chronic IDA, pulmonary infiltrates, hemoptysis in young child

Adolescent menorrhagia complications: chronic fatigue, school absence, syncope

Counsel families that early treatment matters — neurocognitive recovery is incomplete if deficiency is prolonged.

When to Escalate — Hospitalization and Consults

— Hb <5–6 with symptoms (tachycardia, dyspnea, syncope, altered mentation, heart failure signs)

— Active GI bleeding, hemodynamic instability

— Severe anemia requiring transfusion in a child with cardiopulmonary disease

— Suspected non-accidental trauma or neglect contributing to severe nutritional deficiency

— Failure of outpatient management with concern for serious underlying disease

— Pediatric hematology: refractory IDA, suspected hemoglobinopathy, need for IV iron, transfusion planning, evaluation for von Willebrand disease in menorrhagia

— Pediatric GI: suspected celiac, IBD, H. pylori, occult GI bleeding, recurrent IDA

— Adolescent medicine / gynecology: heavy menstrual bleeding, eating disorders

— Nephrology: CKD-associated anemia, need for ESA

— Cardiology: cyanotic CHD with relative anemia

— Lead poisoning / public health: elevated lead level, environmental assessment

— Food insecurity, WIC enrollment assistance

— Suspected nutritional neglect

— Refugee / immigrant health navigation

CCS pearl: For a toddler with Hb 4.2 brought in for pallor and tachypnea: admit to floor with telemetry, IV access, type and crossmatch, slow PRBC transfusion 5 mL/kg over 4 hours with furosemide, start oral iron once stable, consult hematology, screen for celiac and lead, and arrange close outpatient follow-up. Advancing the CCS clock prematurely past stabilization loses points.

Outpatient management is appropriate for the vast majority of pediatric IDA cases.

Hospitalize when:

Transfuse cautiously in chronic severe IDA — 5 mL/kg over 4 hours, often with furosemide; rapid transfusion risks TACO and pulmonary edema in chronically compensated anemia

Specialty consultation:

Social work / nutrition:

Always involve social work when nutritional neglect or food insecurity is contributing — addresses both immediate and recurrent risk.

Key Differentials — Other Microcytic Anemias

— Asymptomatic carrier state; microcytic indices but normal-to-elevated RBC count, normal RDW, normal ferritin

— Mentzer index <13 favors thalassemia

— β-thalassemia trait: HbA2 >3.5% on electrophoresis

— α-thalassemia trait: electrophoresis often normal; diagnosed by exclusion or genetic testing

— Family ancestry: Mediterranean, African, Middle Eastern, South/SE Asian

— Do not give iron to a child with thalassemia trait without IDA — risk iron overload

— Microcytic or normocytic; elevated ferritin, low TIBC, low TSAT

— Hepcidin-mediated iron sequestration

— Associated with chronic infection, JIA, IBD, malignancy

— Microcytic anemia with basophilic stippling on smear

— Often coexists with IDA in toddlers

— Symptoms: abdominal pain, irritability, neurodevelopmental regression

— Check venous lead level — capillary if elevated must be confirmed venously

— Rare in children; congenital (X-linked, ALAS2) or acquired

— Ring sideroblasts on marrow; elevated ferritin and TSAT

— Microcytic and dimorphic smear

Key distinction: Microcytic with high RBC count and normal RDW → thalassemia trait. Microcytic with low RBC count and high RDW → IDA. Microcytic with basophilic stippling → consider lead. Microcytic with high ferritin → chronic inflammation or sideroblastic.

Microcytic anemia differential (the "TICS" mnemonic): Thalassemia, Iron deficiency, Chronic disease/inflammation, Sideroblastic/lead.

α- and β-thalassemia trait:

Anemia of chronic inflammation:

Lead poisoning:

Sideroblastic anemia:

Copper deficiency, vitamin B6 deficiency — rare, but cause microcytic anemia

In a stem with persistent microcytosis despite iron therapy and no GI losses, the answer is usually hemoglobin electrophoresis to evaluate for thalassemia trait.

Key Differentials — Other-Category Causes of Pediatric Anemia

— Acute blood loss — Hb drops over 24–48 hours; initially normocytic with reticulocytosis

— Hemolytic anemias:

– Hereditary spherocytosis — splenomegaly, jaundice, +osmotic fragility/EMA binding, family history; treat with folate, splenectomy in severe disease

– G6PD deficiency — episodic hemolysis with oxidant stress (fava beans, sulfa, naphthalene)

– Autoimmune hemolytic anemia — positive direct Coombs, elevated reticulocyte count, jaundice

– Sickle cell disease — Hb electrophoresis diagnostic; chronic hemolysis

— Anemia of chronic disease in active inflammation

— B12 deficiency — exclusively breastfed infant of vegan mother, ileal disease; neurologic findings

— Folate deficiency — malnutrition, goat's milk feeding, hemolysis, anticonvulsants

— Hypothyroidism, liver disease, Diamond-Blackfan anemia (congenital pure red cell aplasia)

— Leukemia — pallor + bruising + bone pain + lymphadenopathy + hepatosplenomegaly; CBC shows cytopenias or blasts

— Aplastic anemia — pancytopenia, low reticulocytes

— Transient erythroblastopenia of childhood (TEC) — well-appearing toddler with normocytic anemia, low retics, self-resolving

— Parvovirus B19 — aplastic crisis in hemolytic disease

Step 3 management: A 2-year-old with pallor, bruising, hepatosplenomegaly, and bicytopenia — this is not IDA. Order peripheral smear and refer urgently for leukemia workup before any iron is given. Splenomegaly, lymphadenopathy, and abnormal cell lines are red flags that derail the IDA pathway.

Normocytic anemias to consider when initial workup is atypical:

Macrocytic anemias:

Marrow failure / infiltration:

Renal disease: chronic kidney disease → erythropoietin deficiency, normocytic anemia

Always interpret the CBC in full — MCV alone is insufficient; check reticulocyte count, RDW, smear, and other lineages.

Secondary Prevention and Long-Term Plan

— Iron-rich foods at every meal: meat, poultry, fish, beans, lentils, iron-fortified cereals

— Vitamin C-containing foods paired with non-heme iron sources

— Limit cow's milk to 16–24 oz/day after age 1; switch to reduced-fat milk at age 2 per AAP

— Avoid juice (low iron, displaces nutrient-dense foods); limit to ≤4 oz/day if any

— Address food insecurity: WIC, SNAP, school nutrition programs

— Celiac → gluten-free diet, repeat tTG-IgA at 6–12 months

— IBD → maintenance therapy

— Menorrhagia → hormonal management (combined OCPs, progestin-only, LNG-IUD), evaluate for bleeding disorder if heavy from menarche

— H. pylori → confirm eradication

— In high-risk children, recheck Hb annually

— Adolescent menstruating females: periodic screening per risk

— Term breastfed: 1 mg/kg/day from 4 months

— Preterm: 2 mg/kg/day from 1 month through 12 months

— Iron-fortified formula and cereals as transitional staples

Board pearl: Recurrence of IDA after successful treatment in an adolescent female almost always means ongoing blood loss (menorrhagia, GI) or malabsorption (celiac most common) — don't just redose iron; investigate the cause.

Continue iron therapy for 3 months after Hb normalizes to fully replenish stores — premature discontinuation is a common cause of recurrence.

Dietary maintenance counseling:

Address underlying cause:

Repeat screening:

Preventive supplementation policy:

Vaccinations and routine care unchanged — no contraindications from IDA

Document a longitudinal plan with family — Step 3 favors comprehensive, anticipatory pediatric care including dietary, social, and developmental dimensions.

Follow-Up, Monitoring, and Counseling

— Reticulocyte count rises in 5–7 days (early response marker)

— Hb rises ~1 g/dL every 2–4 weeks

— Recheck CBC at 4 weeks — expected ≥1 g/dL increase

— Recheck CBC at 2–3 months; once normalized, continue iron x 3 more months

— Final CBC and ferritin at end of therapy to confirm store repletion

— Document developmental milestones at each well-child visit

— Early intervention referral if delays present

— Reassess pica, restless legs, sleep, school performance

— Iron-rich diet, milk limits, vitamin C pairing

— Iron is a leading cause of pediatric poisoning death — store in original child-proof container, out of reach; even 60 mg/kg elemental iron can be fatal

— Dark stools are expected; bright red or melena is not

— Liquid iron can stain teeth — use a dropper to the back of the mouth, brush after

— Avoid co-administration with milk, tea, calcium, antacids

— Universal Hb screening at 12 months

— Reinforce risk-based screening at subsequent well-child visits

Step 3 management: A 20-month-old started on ferrous sulfate 4 weeks ago returns with Hb risen from 8.0 → 9.5. Next step: continue current iron dose, recheck CBC in 1–2 months, and continue iron for 3 months after Hb fully normalizes. Do not stop early — store repletion takes longer than Hb correction.

Monitoring schedule after starting oral iron:

If inadequate response at 4 weeks, reassess the 3 A's: Adherence, Absorption, Alternative diagnosis (see chunk 7).

Developmental and behavioral follow-up:

Counseling content:

Anticipatory guidance for prevention:

Communicate with family in plain language and address adherence barriers (taste, GI symptoms) — switching to once-daily dosing or polysaccharide complex can improve tolerance.

Ethical, Legal, and Patient Safety Considerations

— A leading cause of pediatric poisoning fatalities, historically the #1 cause before unit-dose packaging

— >60 mg/kg elemental iron is potentially lethal; doses 20–60 mg/kg cause significant toxicity

— Counsel families to store iron in original child-proof containers, out of sight and reach

— Mandatory poison control number on every prescription

— Severe IDA from extreme dietary restriction or food insecurity may warrant CPS referral when caregiver factors are central

— Distinguish poverty/food insecurity (refer to social work, WIC, SNAP) from willful neglect (mandated reporting)

— Document feeding history objectively

— Transfusion: discuss risks (TACO, TRALI, infection, alloimmunization) and obtain consent; Jehovah's Witness families may decline — pursue court order in life-threatening anemia of a minor — pediatric autonomy is overridden by best-interest standard

— Adolescent confidentiality: a teen with menorrhagia or pregnancy-related IDA may invoke confidential care; balance per state law

— Discharge after transfusion or IV iron requires explicit follow-up plan, primary care communication, and medication reconciliation

— Lost-to-follow-up risk is high in IDA — set up the next visit before discharge

— IDA disproportionately affects children in food-insecure households, recent immigrants, and certain racial/ethnic groups — connect to community resources

— Iron supplements: child-resistant packaging mandated by federal regulation since 1997

Board pearl: A Jehovah's Witness family refusing PRBC transfusion for their child with Hb 3.0 and heart failure — Step 3 answer: emergency court order for transfusion to preserve the child's life; parental religious autonomy does not extend to refusing life-saving care for minors.

Iron overdose — accidental pediatric ingestion:

Nutritional neglect and child welfare:

Informed consent and shared decision-making:

Transitions of care:

Health equity:

Universal screening and labeling:

Cultivate trust: aggressive treatment plus transparent communication with families about reasons for screening, treatment duration, and prevention sustains adherence.

High-Yield Associations and Rapid-Fire Facts

Key distinction: IDA = low ferritin, high TIBC, low TSAT, high RDW, low MCV, often thrombocytosis. Thalassemia trait = normal ferritin, high RBC, normal RDW. Anemia of inflammation = high ferritin, low TIBC, low TSAT. Master this triangle.

Cow's milk before 1 year → IDA via blood loss + low iron + calcium-mediated absorption block.

Peak incidence: 9–24 months and adolescent menstruating females.

Smear: microcytic, hypochromic, anisopoikilocytosis, pencil cells, target cells, mild thrombocytosis.

Mentzer index >13 → IDA; <13 → thalassemia trait.

RDW: elevated in IDA, normal in thalassemia trait.

Ferritin <15 ng/mL is diagnostic; <30 highly suggestive.

Ferritin is an acute-phase reactant — interpret with CRP.

Soluble transferrin receptor is elevated in IDA, normal in anemia of inflammation — useful when mixed picture.

Reticulocyte response by day 5–7 of oral iron confirms diagnosis empirically.

Take iron with vitamin C / orange juice, avoid milk/tea/antacids.

Once-daily or every-other-day dosing may improve absorption by avoiding hepcidin spike.

AAP universal Hb screen at 12 months.

Preterm: 2 mg/kg/day from 1 month; term breastfed: 1 mg/kg/day from 4 months.

Cow's milk after 12 months: limit to <20–24 oz/day.

Check lead level in any toddler with IDA.

Refractory IDA → think celiac disease (tTG-IgA + total IgA).

Pica (especially pagophagia) is highly specific for IDA and resolves with treatment.

Restless legs and breath-holding spells improve with iron repletion.

Continue iron 3 months after Hb normalizes.

IDA in first 2 years → potentially irreversible cognitive deficits → primary prevention is paramount.

IV iron preferred in IBD, CKD on dialysis, malabsorption, intolerance.

Severe symptomatic anemia: transfuse 5 mL/kg over 4 hr with diuretic to avoid TACO.

Adolescent menorrhagia + IDA → screen for von Willebrand disease.

Iron poisoning is one of the leading pediatric accidental ingestions — safety counseling is mandatory.

Board Question Stem Patterns

Step 3 management: Recognize the dietary toddler vignette and answer with empiric oral iron + milk limit + 4-week recheck — avoid the "more workup" trap. But recognize atypical features (male adolescent, growth failure, GI symptoms, refractory disease) that demand targeted investigation.

Classic stem 1: 15-month-old, drinks 32 oz whole milk daily, picky eater, well-appearing, Hb 9.2, MCV 68, RDW 16, platelets 540. Best next step: counsel on milk reduction, start oral ferrous sulfate, recheck in 4 weeks. (Not transfusion, not bone marrow biopsy, not electrophoresis.)

Classic stem 2: Asymptomatic 4-year-old of Mediterranean descent, Hb 11.0, MCV 65, RDW 13, RBC 5.6, ferritin 80, no response to iron trial. Diagnosis: β-thalassemia trait. Best test: hemoglobin electrophoresis showing HbA2 >3.5%.

Classic stem 3: 17-year-old with heavy menses since menarche, Hb 8, ferritin 6, prolonged bleeding from minor cuts. Best next step: start oral iron and obtain von Willebrand panel; consider hormonal management of menses.

Classic stem 4: 3-year-old toddler with IDA unresponsive to 8 weeks of adherent oral iron, normal growth declining, intermittent loose stools. Best next step: tissue transglutaminase IgA with total IgA (celiac workup).

Classic stem 5: 2-year-old with IDA, lives in pre-1978 housing, mild developmental delay, pica for paint chips. Best next step: venous blood lead level.

Classic stem 6: Exclusively breastfed 9-month-old, no iron-fortified foods, Hb 9.5. Cause: insufficient iron intake; should have started iron at 4 months. Management: oral iron + introduce iron-fortified cereal/meats.

Classic stem 7: Adolescent on PPI for GERD with persistent IDA despite oral iron. Mechanism: PPI reduces gastric acid → reduced ferrous iron absorption. Next step: trial off PPI or switch to IV iron.

Classic stem 8: Toddler accidentally ingests 60 ferrous sulfate tablets. Management: call poison control, deferoxamine if severe toxicity, supportive care; activated charcoal does NOT bind iron.

Pattern recognition saves time on exam day — most pediatric microcytic anemia stems are IDA from a dietary cause.

One-Line Recap

Pediatric iron deficiency anemia is a preventable, primarily nutritional disease — diagnose with CBC and ferritin, treat empirically with 3–6 mg/kg/day elemental oral iron continued for 3 months after hemoglobin normalizes, prevent through universal screening at 12 months and proactive dietary counseling, and always investigate refractory or atypical cases for celiac disease, ongoing blood loss, or hemoglobinopathy.

Board pearl: The single highest-yield Step 3 intervention for pediatric IDA is dietary counseling at every well-child visit — limit cow's milk, promote iron-rich foods, and pair non-heme iron with vitamin C — because neurocognitive deficits from early IDA may be irreversible, making prevention more impactful than any treatment.

Screen: AAP universal Hb at 12 months; risk-based screening throughout childhood and adolescence; start prophylactic iron in preterm at 1 month (2 mg/kg/day) and term breastfed at 4 months (1 mg/kg/day).

Diagnose: Microcytic, hypochromic anemia with high RDW, low ferritin (<15 diagnostic), low TSAT, mild thrombocytosis; check lead level in toddlers; reserve electrophoresis and GI workup for refractory or atypical presentations.

Treat: Oral ferrous sulfate 3–6 mg/kg/day elemental iron, once daily on empty stomach with vitamin C; limit cow's milk to <20–24 oz/day after age 1; continue iron 3 months after Hb normalizes; reticulocytosis by day 5–7, Hb rise ~1 g/dL/month confirms response.

Escalate: Refractory disease → recheck adherence, evaluate for celiac (tTG-IgA), H. pylori, IBD, ongoing GI/menstrual blood loss, thalassemia trait; use IV iron for malabsorption/intolerance; transfuse cautiously (5 mL/kg over 4 hr with diuretic) only for severe symptomatic anemia.