A 28-year-old woman from rural Maharashtra presents with fatigue, dyspnea on exertion, and menorrhagia for 8 months. She works as a farm laborer and reports a predominantly vegetarian diet with rare meat consumption. On examination: pallor, tachycardia (HR 104/min), and glossitis. Laboratory findings: Hb 7.2 g/dL, MCV 62 fL, serum ferritin 8 ng/mL, serum iron 28 µg/dL (normal 60–170), TIBC 420 µg/dL (normal 250–425), transferrin saturation 6.7%. Peripheral blood smear shows microcytic hypochromic RBCs with target cells. What is the most appropriate next step in management?

Explanation

## Diagnosis and Rationale This patient has **iron deficiency anemia (IDA)** confirmed by the classic laboratory triad: | Parameter | Value | Interpretation | |-----------|-------|----------------| | Serum ferritin | 8 ng/mL | Depleted iron stores (< 15 = iron deficiency) | | Serum iron | 28 µg/dL | Low | | TIBC | 420 µg/dL | Elevated (increased iron-binding capacity) | | Transferrin saturation | 6.7% | Low (< 16% = iron deficiency) | **Key Point:** The combination of microcytic hypochromic anemia, low ferritin, low serum iron, elevated TIBC, and low transferrin saturation is pathognomonic for iron deficiency anemia. **Clinical Pearl:** In this patient, menorrhagia (8 months of heavy periods) is the most likely cause of iron loss in a non-bleeding GI tract. The vegetarian diet with rare meat intake compounds poor iron absorption (plant-based iron is non-heme, poorly absorbed). **High-Yield:** First-line management of iron deficiency anemia is **oral iron supplementation**, not transfusion or further investigations. Ferrous salts (ferrous sulfate 200 mg once or twice daily) are preferred over ferric salts due to better absorption. ## Why Oral Iron First? 1. Oral iron is effective, safe, and cost-effective for mild-to-moderate IDA (Hb > 5 g/dL). 2. Expected response: reticulocytosis in 3–5 days, Hb rise of 1–2 g/dL per week. 3. Reassessment at 4 weeks confirms response; if inadequate, investigate compliance or occult GI bleeding. **Mnemonic:** **IRON response** — Increase in reticulocytes (3–5 days) → Rise in Hb (1–2 g/dL/week) → Oral iron continued for 3–6 months post-correction → Note: reassess at 4 weeks. ## When to Investigate GI Bleeding? Endoscopy is indicated if: - No response to oral iron after 4 weeks (poor compliance ruled out). - Age > 40 years with IDA (higher risk of GI malignancy). - Male patient with IDA (always investigate GI tract). - Overt GI symptoms (melena, hematemesis). This patient is 28 years old with clear menorrhagia; GI endoscopy is **not** the next step.