A 28-year-old primigravida at 20 weeks of gestation presents to the antenatal clinic for routine checkup. She reports fatigue, dyspnea on exertion, and palpitations for the past 2 weeks. On examination, she appears pale, heart rate is 102/min, and blood pressure is 110/70 mmHg. Laboratory investigations reveal hemoglobin 8.2 g/dL, MCV 68 fL, serum ferritin 12 ng/mL, and serum iron 45 µg/dL. What is the most appropriate nutritional intervention for this patient?

Explanation

## Iron Deficiency Anemia in Pregnancy ### Clinical Presentation This patient presents with classic features of iron deficiency anemia (IDA) in pregnancy: - Microcytic anemia (MCV 68 fL, normal 80–100 fL) - Low serum ferritin (12 ng/mL, normal >30 ng/mL) - Low serum iron (45 µg/dL, normal 60–170 µg/dL) - Symptoms: fatigue, dyspnea, palpitations ### Pathophysiology Pregnancy increases iron demands due to: 1. Expanded blood volume (40–50% increase) 2. Fetal and placental iron requirements 3. Increased erythropoiesis **Key Point:** Iron requirements increase from 18 mg/day (non-pregnant) to 27 mg/day in pregnancy, and to 30 mg/day in the third trimester [cite:Park 26e Ch 9]. ### Management of IDA in Pregnancy | Parameter | Oral Iron | Parenteral Iron | |-----------|-----------|------------------| | **First-line** | Yes (symptomatic, Hb >7 g/dL) | Reserved for intolerance/malabsorption | | **Dose** | 60–100 mg elemental iron daily | Iron sucrose 200 mg IV weekly | | **Absorption enhancer** | Vitamin C (ascorbic acid) | Not needed | | **Onset** | 3–4 weeks | 1–2 weeks | | **Hb response** | 1 g/dL per 3–4 weeks | 1 g/dL per 2 weeks | **High-Yield:** Oral iron with vitamin C is the standard first-line treatment for IDA in pregnancy unless there is documented malabsorption, severe GI intolerance, or hemoglobin <7 g/dL [cite:Williams Obstetrics 26e Ch 4]. ### Why Oral Iron with Vitamin C? 1. **Efficacy:** Oral ferrous salts (ferrous sulfate, ferrous fumarate) are well-absorbed when taken on an empty stomach 2. **Vitamin C:** Enhances iron absorption by reducing ferric to ferrous form and maintaining acidic pH 3. **Cost-effective and safe** in pregnancy 4. **Hemoglobin response:** Expected rise of 1 g/dL per 3–4 weeks **Clinical Pearl:** Iron supplementation should continue for 3 months after hemoglobin normalizes to replenish iron stores [cite:RCOG Green-top Guideline 2016]. ### Monitoring - Repeat hemoglobin at 4 weeks - Target hemoglobin: >11 g/dL in second and third trimesters - Assess compliance and GI side effects