## Clinical Assessment This patient has **iron deficiency anemia (IDA)** confirmed by: - Low Hb (7.2 g/dL) - Microcytic indices (MCV 68 fL) - Low serum ferritin (12 ng/mL) — most specific marker for depleted iron stores - Low serum iron with elevated TIBC — confirms iron deficiency - Clear source: menorrhagia in a reproductive-age woman ## Management Algorithm for Iron Deficiency Anemia ```mermaid flowchart TD A["Confirmed IDA with Hb > 7 g/dL"]:::outcome --> B{"Symptoms of high-output state?"}:::decision B -->|No| C["Oral iron therapy"]:::action B -->|Yes| D["Transfusion if Hb < 7 or symptomatic"]:::action C --> E["Recheck Hb in 4 weeks"]:::action E --> F{"Hb rise ≥ 1 g/dL?"}:::decision F -->|Yes| G["Continue iron, investigate cause"]:::action F -->|No| H["Check compliance, consider IV iron"]:::action D --> I["Then start oral iron"]:::action ``` ## Why Oral Iron Therapy Is First-Line **Key Point:** In a non-bleeding, hemodynamically stable patient with Hb > 7 g/dL, oral iron is the standard initial therapy — it is cost-effective, safe, and allows assessment of compliance and absorption. **High-Yield:** The "4-week rule" — if Hb rises by ≥ 1 g/dL in 4 weeks on oral iron, IDA is confirmed and the diagnosis is secure. This response also guides further workup for the cause (menorrhagia vs. GI loss). **Clinical Pearl:** Menorrhagia is the most common cause of IDA in reproductive-age women in India; GI investigation is indicated only if: - No response to oral iron after 4–6 weeks (suggests poor absorption or ongoing GI loss) - Age > 40 years - Male gender - Alarm symptoms (dysphagia, weight loss, melena) ## Dosing & Monitoring | Parameter | Details | |-----------|----------| | **First-line agent** | Ferrous sulfate 200 mg daily (or ferrous fumarate 325 mg) | | **Absorption** | Best on empty stomach; take with vitamin C | | **Expected Hb rise** | 1–2 g/dL per month | | **Recheck timing** | 4 weeks (assess response) | | **Duration** | Continue 3–6 months after Hb normalizes (replete stores) | **Tip:** Counsel on side effects (GI upset, black stools) to improve compliance — the most common reason for "failure" of oral iron is non-adherence, not malabsorption. [cite:Park 26e Ch 8] 
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