Pediatric Anemia: Complete Case Discussion & Key Points
Model Case Presentation
Patient Demographics
Name: Master Arjun, Age: 18 months, Gender: Male, Informant: Mother (Reliable)
Chief Complaints
- Pallor noticed by mother – 3 months
- Decreased activity and lethargy – 2 months
- Poor appetite and fussy eating – 3 months
History Summary
Born at term, birth weight 3.1 kg. Exclusively breastfed until 12 months with no complementary foods started until 10 months. Currently on a diet predominantly of cow's milk (~700 mL/day), rice, and bread — low in iron-rich foods. No meat, poultry, or green leafy vegetables in diet. Mother noticed the child tires quickly during play, has been irritable, and was found to be pale on a routine visit. Child also noted to eat soil/chalk (pica) over the past 2 months. No history of blood in stools, worm infestation noticed, prolonged fever, jaundice, or bleeding from any site.
Born via NVD at term. No perinatal complications. Immunization up to date. Family history: mother had anemia during pregnancy. Non-consanguineous marriage. Low socioeconomic status, vegetarian family.
Examination Summary
| Parameter | Finding | Significance |
|---|---|---|
| Weight | 9.2 kg (↓ for age) | Growth faltering |
| Pallor | Severe (conjunctival, palmar, nail-bed) | Anemia |
| HR | 126/min | Compensatory tachycardia |
| RR | 30/min | Normal |
| Jaundice | Absent | Rules out hemolytic cause |
| Splenomegaly | Absent | Against thalassemia/hemolysis |
| Koilonychia | Present | Specific sign of iron deficiency |
| Angular stomatitis | Present | Iron / B-vitamin deficiency |
CVS: Soft systolic flow murmur at apex (grade 2/6, no thrill) — due to hyperdynamic circulation from severe anemia. No organomegaly. No lymphadenopathy.
CNS: Irritable, mildly lethargic. Developmental milestones appropriate for age (minor delay in language).
✅ Complete Diagnosis
Iron Deficiency Anemia (IDA) — Severe, Nutritional — in an 18-month-old male, due to exclusive/prolonged breastfeeding without adequate complementary feeding and excessive cow's milk intake, presenting with pallor, koilonychia, angular stomatitis, pica, and compensatory tachycardia with flow murmur.
📝 History — Exam Q&A
Iron deficiency is the most common nutritional deficiency worldwide, and Iron Deficiency Anemia (IDA) is the most common cause of anemia globally. In India, >50% of childhood anemia is nutritional in origin (CNNS 2016–18). The National Family Health Survey-5 reported anemia prevalence of 67.1% in under-five children in India.
Anemia is defined as hemoglobin (Hb) concentration more than 2 standard deviations below the mean for age and sex.
| Age Group | Hb Cutoff (g/dL) |
|---|---|
| 6 months – 59 months | < 11.0 |
| 5 – 11 years | < 11.5 |
| 12 – 14 years | < 12.0 |
| Males ≥ 15 years | < 13.0 |
| Non-pregnant females ≥ 15 years | < 12.0 |
💡 Note
In infants under 6 months, physiological anemia occurs due to switch from fetal to adult Hb and shortened RBC lifespan. Hb nadir at 8–12 weeks (~9.5–11 g/dL in term; ~7–9 g/dL in preterm) is normal.
Based on WHO classification (for children 6–59 months, Hb in g/dL):
| Severity | Hb (g/dL) |
|---|---|
| Mild | 10.0 – 10.9 |
| Moderate | 7.0 – 9.9 |
| Severe | < 7.0 |
Severe anemia with Hb < 5 g/dL or Hb < 7 g/dL with clinical features of decompensation (tachycardia, tachypnea, altered consciousness) requires urgent intervention.
| Mechanism | Examples |
|---|---|
| Decreased production | IDA, megaloblastic (B12/folate deficiency), aplastic anemia, anemia of chronic disease, thalassemia (ineffective erythropoiesis) |
| Increased destruction (Hemolytic) | G6PD deficiency, hereditary spherocytosis, sickle cell disease, thalassemia (hemolysis component), autoimmune hemolytic anemia |
| Blood loss | Acute: trauma, GI bleed; Chronic: hookworm, cow's milk protein allergy, menorrhagia |
| Sequestration | Hypersplenism, splenic sequestration crisis (sickle cell) |
| Type | MCV | Causes |
|---|---|---|
| Microcytic Hypochromic | < 70+age(yrs) fL | IDA, thalassemia, sideroblastic anemia, anemia of chronic disease (sometimes) |
| Normocytic Normochromic | Normal for age | Acute blood loss, hemolytic anemia, aplastic anemia, anemia of chronic disease |
| Macrocytic | High for age | B12/folate deficiency, hypothyroidism, liver disease, drugs (methotrexate) |
💡 MCV Normal Lower Limit Formula (Children < 10 years)
MCV (lower limit) = 70 + age in years (fL)
For children ≥ 10 years and adults, lower limit of normal MCV = 80 fL
- Prematurity / low birth weight — reduced iron stores (most iron transferred in 3rd trimester)
- Exclusive breastfeeding beyond 6 months without iron supplementation or complementary foods (breast milk is low in iron)
- Excessive cow's milk intake (>500 mL/day) — low iron content, causes occult GI blood loss, displaces iron-rich foods
- Delayed cord clamping not done — early cord clamping reduces iron transfer by ~30 mg
- Vegetarian/vegan diet — non-heme iron is less bioavailable
- Maternal iron deficiency during pregnancy
- Rapid growth periods — infancy and adolescence (increased demand)
- Recurrent infections / parasitic infestations (hookworm, whipworm)
- Low socioeconomic status
- Type and duration of feeding (breastfeeding, formula, cow's milk)
- Volume of cow's milk per day (>500 mL/day is a major risk factor)
- Age of introduction of complementary foods (normal: 6 months)
- Type of complementary foods — iron-rich foods (meat, green leafy vegetables, legumes, iron-fortified cereals)
- Intake of vitamin C (enhances iron absorption) or inhibitors (tea, coffee, phytates)
- Vegetarian / vegan diet in family
- Any pica (eating soil, chalk, ice — pagophagia) — a classic symptom of IDA
Due to anemia (tissue hypoxia): Pallor, fatigue/easy tiring, decreased activity, irritability, tachycardia, reduced exercise tolerance, poor school performance.
Specific to iron deficiency (non-hematologic):
- Pica — compulsive eating of non-nutritive substances (soil/clay = geophagia; ice = pagophagia)
- Impaired cognitive function, attention, and learning
- Increased susceptibility to infections (iron essential for immune function)
- Behavioral changes, irritability
- Poor weight gain
- Breath-holding spells in toddlers
| Negative Finding | Significance |
|---|---|
| No jaundice | Against hemolytic anemia |
| No dark urine | Against intravascular hemolysis |
| No blood in stools | Against GI bleed as cause |
| No family history of anemia / transfusions | Against hereditary hemolytic anemia (thalassemia, spherocytosis) |
| No exposure to oxidant drugs | Against G6PD hemolytic crisis |
| No prolonged fever / weight loss | Against anemia of chronic disease / malignancy |
| No bleeding tendency | Against aplastic anemia / leukemia |
| Stage | Description | Lab Changes |
|---|---|---|
| Stage 1: Iron Depletion | Iron stores depleted, no functional deficit | ↓ Serum ferritin; bone marrow iron absent |
| Stage 2: Iron-Deficient Erythropoiesis (Iron Deficiency without Anemia) | Iron stores absent, insufficient iron for normal erythropoiesis; Hb still normal | ↓ Ferritin, ↓ Serum iron, ↑ TIBC, ↓ Transferrin saturation, ↑ FEP/ZPP; normal Hb |
| Stage 3: Iron Deficiency Anemia | Hb falls below normal; microcytic hypochromic anemia | All of above + ↓ Hb, ↓ MCV, ↓ MCH, ↓ MCHC, ↑ RDW, microcytic hypochromic RBCs on smear |
Key: Ferritin is the first lab value to fall; Hb is the last. RDW increases before MCV falls in early iron deficiency.
- Low iron content in cow's milk (~0.5 mg/L, very poorly absorbed)
- Displaces iron-rich foods from the diet (milk fills the child up, reducing appetite for solid foods)
- Causes occult GI blood loss — cow's milk protein causes microscopic intestinal blood loss in infants and toddlers, worsening iron balance
- Calcium in cow's milk inhibits iron absorption
- Casein protein may interfere with iron absorption
Recommendation: Limit cow's milk to ≤ 500 mL/day after 12 months; avoid before 12 months of age.
🩺 Examination — Exam Q&A
Pallor is assessed at multiple sites. Most reliable (least affected by pigmentation):
- Conjunctival pallor (palpebral conjunctiva — most reliable in all skin tones)
- Palmar pallor (hands show pallor only in moderate-severe anemia when compared to examiner's palms)
- Nail-bed pallor
- Tongue / buccal mucosa
- Skin (least reliable in dark-skinned individuals)
WHO WHO IMCI grades palmar pallor as: Some pallor (Hb ~7–10 g/dL) and Severe pallor (Hb <7 g/dL).
| Sign | Significance |
|---|---|
| Koilonychia (spoon-shaped nails) | Classic — specific for iron deficiency; nails become soft, thin, and concave |
| Angular stomatitis (cheilosis) | Cracks at corners of mouth — iron and/or B-complex deficiency |
| Glossitis / atrophic tongue | Smooth, beefy-red tongue — iron ± B12/folate deficiency |
| Brittle/ridged nails | Iron deficiency |
| Pallor of mucous membranes | Non-specific for anemia |
| Hair loss / thinning | Iron deficiency |
💡 Plummer-Vinson Syndrome (Paterson-Kelly Syndrome)
Triad of: Iron deficiency anemia + Dysphagia + Postcricoid esophageal web. Rarely seen in children; classically in middle-aged women. Associated with increased risk of postcricoid carcinoma.
In severe anemia, decreased oxygen-carrying capacity triggers compensatory hyperdynamic circulation:
- Tachycardia — increased cardiac output
- Soft systolic flow murmur (grade 1–3/6) — best heard at apex or LLSB — due to turbulent low-viscosity blood flow through normal valves (not structural)
- Bounding/collapsing pulse — increased stroke volume
- Cardiomegaly — in chronic severe anemia (ventricular dilatation)
- High-output cardiac failure — in very severe/acute anemia (hepatomegaly, gallop rhythm, pulmonary edema)
The flow murmur of anemia disappears once the Hb is corrected — important to differentiate from structural murmurs.
| Feature | IDA | Hemolytic Anemia |
|---|---|---|
| Jaundice | Absent | Present (indirect hyperbilirubinemia) |
| Splenomegaly | Absent/mild | Commonly present |
| Urine color | Normal | Dark (hemoglobinuria in intravascular) |
| Koilonychia | May be present | Absent |
| Bone changes | Absent | Hair-on-end in thalassemia |
| Frontal bossing | Absent | In severe thalassemia (marrow expansion) |
- Pallor (often lemon-yellow tinge — pallor + mild jaundice)
- Smooth beefy-red glossitis
- Neurological signs (B12 deficiency specifically) — subacute combined degeneration: dorsal column (loss of vibration, proprioception), lateral column (UMN signs), peripheral neuropathy, and in infants — developmental regression, hypotonia, irritability
- Skin hyperpigmentation (especially over knuckles and skin folds)
- Mild jaundice (intramedullary hemolysis)
- In exclusively breastfed infants of vegetarian/vegan mothers — B12 deficiency may present as developmental delay and regression, hypotonia, and macrocytic anemia
Aplastic anemia = pancytopenia (failure of all 3 cell lines) → look for:
- Pallor (anemia — low RBCs)
- Bleeding manifestations — petechiae, purpura, ecchymosis, mucosal bleeding (thrombocytopenia)
- Recurrent severe infections (neutropenia)
- No splenomegaly, no lymphadenopathy (in contrast to leukemia)
- In Fanconi anemia (inherited aplastic anemia): café-au-lait spots, short stature, thumb/radial abnormalities, renal anomalies
🔬 Investigations — Exam Q&A
| Parameter | Finding in IDA |
|---|---|
| Hemoglobin | ↓ (below age-appropriate cutoff) |
| MCV | ↓ (microcytic) |
| MCH | ↓ (< 27 pg) |
| MCHC | ↓ (hypochromic; < 30 g/dL) |
| RDW | ↑ (>14% — anisocytosis; first CBC parameter to change in IDA) |
| Platelet count | Often mildly ↑ (reactive thrombocytosis); severe IDA may cause thrombocytopenia |
| Reticulocyte count | Normal or low (inadequate production) |
| WBC | Normal |
- Microcytes — small RBCs (MCV below normal for age)
- Hypochromia — pale RBCs with increased area of central pallor (>1/3 of cell diameter)
- Anisocytosis — variation in RBC size (first change, corresponds to ↑ RDW)
- Poikilocytosis — variation in shape (elliptocytes/pencil cells, target cells in severe IDA)
- Occasional target cells (codocytes)
- Pencil cells (cigar-shaped RBCs)
- In very mild IDA — smear may appear near-normal; RDW is more sensitive
💡 Anisocytosis = ↑ RDW
RDW is the earliest CBC change in IDA. Anisocytosis on smear corresponds to elevated RDW. A normal RDW with microcytosis suggests thalassemia trait (uniform small cells) rather than IDA.
| Test | IDA | Significance |
|---|---|---|
| Serum Ferritin | ↓ (<12 µg/L diagnostic; <30 µg/L suspicious) | Best single test for iron stores; first to fall in iron depletion. Caveat: Acute phase reactant — falsely elevated in infection/inflammation |
| Serum Iron | ↓ | Reflects iron in transit; variable; less sensitive than ferritin |
| TIBC (Total Iron Binding Capacity) | ↑ | Reflects transferrin; rises as body attempts to absorb more iron. Inverse of iron stores. |
| Transferrin Saturation | ↓ (<15% in IDA) | = (Serum Iron / TIBC) × 100; low when iron supply is insufficient |
| Free Erythrocyte Protoporphyrin (FEP/ZPP) | ↑ | Accumulates when iron unavailable for heme synthesis; also elevated in lead poisoning |
Mentzer Index = MCV / RBC count
| Value | Interpretation |
|---|---|
| > 13 | Consistent with IDA (few large cells, fewer RBCs) |
| < 13 | Suggests Thalassemia trait (many small cells; high RBC count) |
Useful simple bedside tool to distinguish IDA from thalassemia trait when iron studies are unavailable. Not 100% specific — interpret with full clinical picture.
| Feature | IDA | β-Thal Trait |
|---|---|---|
| Hb | ↓ | Normal / mildly ↓ |
| MCV | ↓ | ↓ (often more severely ↓) |
| RBC count | ↓ | Normal or ↑ |
| RDW | ↑ (anisocytosis) | Normal (uniform microcytes) |
| Mentzer Index | > 13 | < 13 |
| Serum Ferritin | ↓ | Normal or ↑ |
| TIBC | ↑ | Normal |
| Hb Electrophoresis | Normal (HbA2 may be low in IDA) | ↑ HbA2 (>3.5%) and/or HbF |
🚨 Important Caveat
Coexisting IDA can falsely normalize HbA2 in β-thalassemia trait. Always correct iron deficiency first before performing hemoglobin electrophoresis for definitive diagnosis of thalassemia trait.
- Macrocytic anemia — ↑ MCV (>100 fL)
- Hypersegmented neutrophils (≥5 lobes in >5% of neutrophils; or any cell with ≥6 lobes) — pathognomonic
- Megaloblasts on bone marrow (large cells, nuclear-cytoplasmic asynchrony)
- Oval macrocytes (macro-ovalocytes) on smear
- Pancytopenia in severe deficiency (leukopenia, thrombocytopenia + anemia)
- ↑ LDH and indirect bilirubin (intramedullary hemolysis)
- Low serum B12 or folate levels confirm diagnosis
The Prussian blue stain of bone marrow to assess macrophage iron stores is the gold standard for diagnosing iron deficiency. However, it is invasive and not routinely done.
In clinical practice, serum ferritin is the best non-invasive test for iron stores (first to fall, most sensitive).
Bone marrow aspiration is indicated in anemia when:
- Pancytopenia with suspected aplastic anemia or leukemia
- Anemia not responding to appropriate treatment
- Anemia with blast cells or atypical cells on peripheral smear
- Anemia with lymphadenopathy + splenomegaly (storage disorders, malignancy)
Bone marrow is NOT needed for routine IDA diagnosis or for thalassemia diagnosis.
In a child with microcytic hypochromic anemia + dietary risk factors for IDA (without features suggesting other diagnoses), a therapeutic trial of oral iron (3–6 mg/kg/day elemental iron) can serve as both treatment and confirmation:
- Reticulocytosis within 5–10 days (earliest response — "reticulocyte crisis")
- Hb rises ≥ 1.0 g/dL by 4 weeks — confirms IDA diagnosis
- Normalization of Hb within 6–8 weeks
If Hb does NOT rise by 1 g/dL in 4 weeks → reconsider diagnosis (thalassemia, malabsorption, non-compliance, ongoing blood loss, wrong diagnosis).
| Test | Finding in Hemolysis |
|---|---|
| Peripheral smear | Spherocytes (hereditary spherocytosis, AIHA), sickle cells, target cells, schistocytes (TTP/HUS) |
| Reticulocyte count | ↑ (compensatory erythroid hyperplasia) |
| Serum bilirubin | ↑ indirect (unconjugated) bilirubin |
| LDH | ↑ (released from lysed RBCs) |
| Serum haptoglobin | ↓ (binds free Hb; consumed in hemolysis) |
| Direct Coombs Test (DAT) | Positive in AIHA; negative in non-immune hemolysis |
| G6PD assay | ↓ G6PD activity in G6PD deficiency |
| Osmotic fragility test | Increased in hereditary spherocytosis |
| Hb electrophoresis | Abnormal bands in hemoglobinopathies |
💊 Management — Exam Q&A
Oral iron therapy is the treatment of choice.
| Parameter | Recommendation |
|---|---|
| Preparation | Ferrous sulfate (most widely used, cost-effective). Ferrous gluconate / fumarate are alternatives (better tolerated). |
| Dose | 3–6 mg/kg/day of elemental iron, in 1–2 divided doses (IAP / standard pediatric practice) |
| Administration | Empty stomach or between meals for best absorption. Give with orange juice (Vitamin C enhances absorption). Avoid with milk, tea, calcium supplements. |
| Duration | Continue for 3 months after Hb normalizes (to replenish stores). Total usual treatment: 4–6 months. |
| Response check | Reticulocytosis in 5–10 days; Hb ↑ ≥ 1 g/dL at 4 weeks |
💡 Elemental Iron Content
Ferrous sulfate contains 20% elemental iron (100 mg ferrous sulfate = 20 mg elemental iron). Always calculate dose in elemental iron, not salt weight.
- Failure of oral iron therapy (non-compliance, malabsorption — e.g., celiac disease, post-GI surgery)
- Intolerance of oral iron (severe GI side effects)
- Ongoing significant blood loss that cannot be managed with oral iron alone
- Inflammatory bowel disease (oral iron worsens mucosal inflammation)
- Need for rapid iron repletion (e.g., pre-operatively)
- Chronic kidney disease patients on erythropoietin-stimulating agents
IV iron preparations: Iron sucrose (Venofer) — most commonly used in children; Iron dextran; Ferric carboxymaltose.
Transfusion is guided by clinical state, not Hb alone. General indications:
- Hb < 5 g/dL regardless of symptoms — high risk of cardiac failure
- Hb < 7 g/dL with symptoms of cardiovascular compromise (tachycardia, tachypnea, poor perfusion, altered consciousness)
- Hb < 7–8 g/dL with ongoing active blood loss or high surgical risk
Transfusion in chronic severe anemia (e.g., Hb ~4 g/dL but compensated): Give packed RBCs slowly — 5 mL/kg over 3–4 hours per aliquot with furosemide cover to avoid fluid overload. Each 5 mL/kg transfusion raises Hb by ~1 g/dL.
🚨 Important
In severe chronic anemia (Hb < 5 g/dL), the child may be compensated with a high cardiac output state. Rapid transfusion can precipitate acute cardiac failure. Always transfuse slowly, and give IV iron concurrently to replenish stores.
Foods that ENHANCE iron absorption:
- Vitamin C (citrus fruits, amla, guava) — take with iron-rich foods or iron tablets
- Heme iron (animal sources) — red meat, poultry, fish (most bioavailable: 15–35% absorption)
- Non-heme iron (plant sources) — absorption 2–20%; enhanced by vitamin C
Foods that INHIBIT iron absorption: Calcium/dairy products, tea, coffee, phytates (in whole grains, legumes), polyphenols, oxalates, antacids.
Counseling points:
- Limit cow's milk to ≤ 500 mL/day
- Introduce complementary iron-rich foods (meat, iron-fortified cereals, green leafy vegetables) by 6 months
- Avoid tea/coffee within 1 hour of meals
- Cook in iron utensils (increases non-heme iron content)
- Delayed cord clamping (≥1–3 min) increases iron stores at birth
| Age Group | IAP Recommendation |
|---|---|
| Preterm / LBW infants | Iron supplementation: 2 mg/kg/day elemental iron from 2–4 weeks of age until 12 months |
| Term breastfed infants | Supplemental iron 1 mg/kg/day from 4–6 months until iron-rich foods are adequate |
| 6–24 months (high-risk) | Universal supplementation in developing countries: 1 mg/kg/day. Screening Hb at 9 months (AAP), 6 months (high-risk) |
| Under-5 (WIFS – Weekly Iron Folic Acid Supplementation) | India: Government program — weekly IFA tablets for children 6 months–5 years |
| School-going children (5–10 years) | WIFS: weekly iron (45 mg elemental) + folic acid (400 µg) |
| Adolescents (WIFS) | Weekly IFA supplementation under National Iron Plus Initiative (NIPI), India |
- GI side effects (most common): nausea, vomiting, epigastric discomfort, constipation, diarrhea — dose-dependent; giving with food reduces GI side effects but also reduces absorption
- Black/dark stools — normal, expected (warn parents)
- Black staining of teeth — from liquid formulations; use a straw, brush teeth after
- Reversible darkening of skin — rare
If GI intolerance is severe, consider: switching to ferrous gluconate/fumarate (better tolerated), reducing dose frequency, giving with food (reduces absorption by ~40%), or IV iron.
- Impaired cognitive development and learning — iron essential for myelination, neurotransmitter synthesis (serotonin, dopamine). May be irreversible if severe deficiency in first 2 years of life (critical period of brain development)
- Impaired immune function — increased susceptibility to infections (iron needed for oxidative burst in neutrophils, lymphocyte proliferation)
- Impaired physical growth
- High-output cardiac failure — in severe anemia
- Fatigue and reduced exercise capacity
- Breath-holding spells in toddlers
- Thrombocytosis — reactive, may increase thrombotic risk
- Impaired thyroid metabolism (iron required for thyroid peroxidase)
Vitamin B12 deficiency:
- Cyanocobalamin or Hydroxocobalamin IM (preferred route if malabsorption/pernicious anemia)
- Dose: 1000 µg IM daily × 7 days, then weekly × 4 weeks, then monthly for life (if pernicious anemia)
- Oral B12 high-dose supplementation (1000 µg/day) is effective in nutritional deficiency
Folate deficiency:
- Folic acid 1–5 mg/day orally × 3–4 months
🚨 Critical
Never give folate alone without ruling out B12 deficiency. Folate corrects the anemia of B12 deficiency but accelerates neurological damage (subacute combined degeneration). Always check both B12 and folate together.
- Non-compliance (most common) — taste, GI side effects
- Wrong diagnosis — thalassemia trait, anemia of chronic disease
- Ongoing blood loss exceeding iron replacement (hookworm, GI bleed, menorrhagia)
- Malabsorption — celiac disease, H. pylori infection, inflammatory bowel disease, post-surgical (gastrectomy)
- Coexisting B12/folate deficiency limiting erythropoietic response
- Coexisting infection/inflammation — hepcidin-mediated iron sequestration
- Inadequate dose
- Iron-refractory iron deficiency anemia (IRIDA) — rare genetic disorder (TMPRSS6 mutation) causing persistently elevated hepcidin and iron malabsorption
🔭 Recent Advances — Exam Q&A
Hepcidin is a peptide hormone produced by the liver — the master regulator of iron homeostasis.
- It binds and degrades ferroportin, the only known cellular iron exporter, blocking iron absorption from the gut and iron release from macrophages/liver
- Hepcidin is suppressed in IDA (allowing maximum iron absorption)
- Hepcidin is elevated in anemia of chronic disease/inflammation (inflammatory cytokines increase hepcidin → iron sequestration → functional iron deficiency despite normal stores)
- In IRIDA (Iron-Refractory Iron Deficiency Anemia), TMPRSS6 mutation causes persistently high hepcidin → iron unresponsive to oral supplementation; responds to IV iron
- Low hepcidin → key mechanism of iron absorption upregulation in IDA; explains why alternate-day iron dosing may be more effective (each dose temporarily raises hepcidin, and allowing 24–48 hours for hepcidin to fall before next dose maximizes absorption)
Oral iron transiently increases hepcidin for 24 hours, reducing absorption of subsequent doses. Studies (Stoffel et al.) showed that alternate-day morning iron dosing results in greater fractional iron absorption compared to twice-daily dosing. This is because hepcidin returns to baseline by the next day, allowing maximal absorption from each dose. Current evidence supports once-daily dosing on alternate days as a strategy with equal or better efficacy and potentially fewer GI side effects. However, IAP still recommends daily dosing in practice for ease of adherence.
| Preparation | Key Feature |
|---|---|
| Iron Sucrose (Venofer) | Most widely used in pediatrics; given as slow IV infusion; relatively safe |
| Ferric Carboxymaltose (FCM) | Can deliver high dose in single infusion; faster repletion; increasingly used in older children/adolescents |
| Low Molecular Weight Iron Dextran | Can give total dose infusion; higher risk of anaphylaxis vs. newer agents |
| Ferric Derisomaltose (Monoferric) | Newer; single high-dose infusion possible; being studied in pediatric populations |
Ferric carboxymaltose is gaining favor in adolescents and older children due to single-dose convenience. All IV iron preparations require monitoring for hypersensitivity reactions.
- Reticulocyte Hemoglobin Equivalent (Ret-He / CHr) — reflects iron availability for erythropoiesis in real-time; falls before Hb; a cut-off of <29 pg recommended by British Society of Haematology for IDA in children. Rises early in response to treatment. Increasingly available on modern automated analyzers.
- Soluble Transferrin Receptor (sTfR) — reflects iron demand at tissue level; elevated in IDA but NOT in anemia of chronic disease (useful to distinguish). Not affected by acute phase reactants. sTfR/log ferritin ratio = Thomas Plot — distinguishes IDA from anemia of chronic disease from functional iron deficiency.
- Zinc Protoporphyrin (ZPP/FEP) — elevated in both IDA and lead poisoning; used as screening tool in some settings
- Hepcidin assay — low in IDA; high in inflammation; useful in research and complex cases
India's National Iron Plus Initiative (NIPI) is a comprehensive government program to address anemia across the lifecycle under the National Health Mission:
| Age Group | Intervention |
|---|---|
| Infants 6–59 months | IFA syrup: 1 mg/kg/day elemental iron, 5 days/week |
| Children 5–10 years | IFA tablet weekly: 45 mg elemental iron + 400 µg folic acid |
| Adolescents 10–19 years | WIFS: weekly IFA tablet (45 mg iron + 400 µg folate) throughout the year |
| Pregnant women | Daily IFA: 100 mg elemental iron + 500 µg folate for ≥ 180 days |
| Postpartum women | Daily IFA: 100 mg + 500 µg folate for 180 days postpartum |
Delivered through ASHA workers, Anganwadi centres, and schools (Mid-Day Meal Program).
⚡ Key Points — Quick Revision
One-Liners for Exam
- Most common anemia worldwide: Iron Deficiency Anemia
- Most common nutritional deficiency: Iron deficiency
- Anemia in children <5 yrs (WHO): Hb < 11.0 g/dL
- Severity — Severe: Hb < 7 g/dL; Mild: 10–10.9 g/dL; Moderate: 7–9.9 g/dL
- MCV lower limit in children: 70 + age in years (fL); ≥10 yrs: 80 fL
- First CBC change in IDA: ↑ RDW (anisocytosis)
- Most sensitive test for iron stores: Serum ferritin (<12 µg/L = diagnostic)
- Ferritin in inflammation: Falsely elevated (acute phase reactant)
- TIBC in IDA: ↑ (inverse of iron stores)
- Mentzer Index: MCV/RBC — >13 = IDA; <13 = Thalassemia trait
- Coexisting IDA + β-thal: IDA falsely lowers HbA2 — correct iron first before electrophoresis
- Specific signs of iron deficiency: Koilonychia, angular stomatitis, pica, glossitis
- Flow murmur in anemia: Soft systolic murmur due to hyperdynamic circulation — disappears with Hb correction
- IDA treatment dose: 3–6 mg/kg/day elemental iron; continue 3 months after Hb normalizes
- Reticulocyte crisis: Reticulocytosis at 5–10 days after starting iron = first sign of response
- Therapeutic trial response: Hb ↑ ≥1 g/dL at 4 weeks confirms IDA
- Excessive cow's milk (>500 mL/day): Major risk factor for IDA — occult GI blood loss + displaces iron-rich food
- Vitamin C: Enhances non-heme iron absorption; give with iron tablet
- Tea / calcium / phytates: Inhibit iron absorption
- Folate alone without B12: Corrects anemia but worsens neurological damage in B12 deficiency — always check both
- Hypersegmented neutrophils: Pathognomonic of megaloblastic anemia
- Hepcidin: Master regulator of iron homeostasis; ↓ in IDA (allows absorption); ↑ in chronic disease (sequesters iron)
- IRIDA: Iron-refractory IDA due to TMPRSS6 mutation → high hepcidin → IV iron required
- India's NIPI program: Weekly IFA supplementation for school children and adolescents (WIFS)
- Delayed cord clamping ≥1 min: Increases neonatal iron stores by ~30 mg — prevents early-onset IDA
💡 High-Yield Differentials — Microcytic Anemia
- Iron deficiency anemia — ↓ ferritin, ↑ TIBC, ↑ RDW, ↑ Mentzer index (>13)
- Thalassemia trait — normal ferritin, normal TIBC, normal RDW, ↓ Mentzer (<13), ↑ HbA2 on electrophoresis
- Anemia of chronic disease — ↑ ferritin, ↓ TIBC, normal/↑ ferritin
- Sideroblastic anemia — ↑ ferritin, ↑ serum iron, ring sideroblasts on BM
- Lead poisoning — ↑ FEP/ZPP, basophilic stippling, exposure history