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Iron Deficiency Anemia in Pregnant Women: Prevention, Management, and Health Programs

1. Epidemiology and Significance

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2. Definition and Diagnosis

• 1st and 3rd trimester: Hb < 11.0 g/dL
• 2nd trimester: Hb < 10.5 g/dL (revised in 2024, as updated WHO guidelines now account for physiologic hemodilution)

• Low serum ferritin (most accurate lab value) - ferritin < 30 µg/L suggests depleted stores
• Low serum iron + high TIBC + low % saturation
• Microcytic, hypochromic RBCs on peripheral smear (MCV < 80 fL)
• Reticulocyte count used to monitor response to therapy

1. Pre-latent: Reduced marrow iron stores, decreased ferritin only
2. Latent: Abnormal iron studies (low iron, high TIBC), but Hb still normal
3. Manifest IDA: Decreased Hb, then decreased MCV - Creasy & Resnik, p. 1333

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3. Adverse Effects on Mother and Fetus

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4. Prevention

A. Pre-pregnancy Optimization

• Correct iron stores before conception
• Treat causes of blood loss (menorrhagia, parasitic infections)
• Reproductive-age women counseled on iron-rich diet

B. Dietary Measures

• Animal sources (heme iron - better absorbed): liver, red meat, poultry, fish, shrimp
• Plant sources (non-heme): lentils, beans, dark leafy vegetables, tofu, nuts and seeds, dried fruits, fortified cereals

• Vitamin C-rich foods: orange juice, strawberries, broccoli, bell peppers (take alongside iron)

• Tea, coffee (tannins), phytates (in unprocessed cereals), calcium-rich foods

C. Prophylactic Supplementation (WHO Recommendation)

• WHO 2024: Daily 30-60 mg elemental iron + 400 µg folic acid throughout pregnancy
• A 2024 Cochrane systematic review (PMID: 39145520) confirmed daily oral iron supplementation during pregnancy reduces maternal anemia at delivery and improves birth weight outcomes
• Iron supplementation reduces the incidence of anemia by as much as 73% - Creasy & Resnik, p. 1333

D. Deworming

• One dose of albendazole 400 mg after the first trimester (preferably second trimester) in endemic areas - reduces hookworm-related iron loss

E. Food Fortification

• Double-fortified salt (iron + iodine)
• Fortified rice in public welfare programs

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5. Management

A. Oral Iron Therapy (First Line)

• Ferrous sulfate 325 mg (contains ~65 mg elemental iron) once to three times daily
• WHO recommends 60 mg elemental iron/day with folic acid; 30 mg may suffice with micronutrients
• Take on an empty stomach, or with 500 mg ascorbic acid to enhance absorption
• Avoid antacids and calcium supplements within 2 hours of iron dose

• Reticulocytosis in 7-10 days (earliest sign of response)
• Hb can rise by up to 1 g/dL per week in severe cases
• Continue therapy 6 months after anemia resolves to replenish stores

• Nausea, constipation, abdominal cramps, diarrhea - reduce dose or switch to ferrous sulfate syrup for dose titration
• Enteric-coated preparations reduce GI effects but also reduce absorption

• Wrong diagnosis (thalassemia, B12/folate deficiency)
• Malabsorption
• Non-compliance
• Ongoing blood loss
• Vitamin B6 deficiency (B6 normally decreases in pregnancy; supplementation with B6 + iron improves Hb)

B. Parenteral (IV) Iron

• Oral iron not tolerated or absorbed
• Moderate/severe anemia in 2nd or 3rd trimester
• Non-compliance with oral therapy
• Rapid Hb correction needed near term

• Adverse effects: urticaria, dyspnea, pruritus, tachycardia, chills
• Severe anaphylaxis is now rare; test dose only needed for LMW iron dextran

C. Blood Transfusion

• Reserved for severe anemia (Hb < 6-7 g/dL) or when the patient is symptomatic, near delivery, or has fetal compromise
• Maternal transfusion should be considered for fetal indications when Hb < 6 g/dL is associated with non-reassuring FHR or reduced amniotic fluid

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6. Screening Recommendations (USPSTF 2024)

• Screening for iron deficiency anemia in pregnant women - I grade (insufficient evidence to recommend universal screening in asymptomatic pregnant women in resource-rich settings)
• Supplementation is recommended for at-risk pregnant women
• Clinicians should consider social determinants like food insecurity when assessing risk

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7. National Health Programs

India - Anemia Mukt Bharat (AMB) Strategy (Launched 2018)

• Antenatal clinics (ANC) in PHCs, CHCs, hospitals
• Village Health, Sanitation and Nutrition Days (VHSND)
• Anganwadi centers (AWCs) via ICDS
• ASHA workers for community-level follow-up

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Other Major Global Programs

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8. Summary of Key Management Algorithm

Anemia detected in pregnancy (Hb < 11 g/dL)
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Confirm iron deficiency (serum ferritin, iron studies)
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Mild (Hb 10-10.9)          Moderate (7-9.9)          Severe (<7)
        ↓                          ↓                        ↓
Oral ferrous sulfate       Oral iron ± IV iron         IV iron / transfusion
+ dietary counseling       (2nd/3rd trimester)         + urgent referral
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Monitor: reticulocytosis at 7-10 days, Hb rise ~1 g/wk
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Continue iron 6 months post-resolution

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Recent Evidence (2024-2025)

• Cochrane Review 2024 (PMID: 39145520): Daily oral iron in pregnancy significantly reduces maternal anemia at delivery, and is associated with higher birth weight and lower risk of LBW infants.
• Maternal-Neonatal anemia link (PMID: 39425056): Systematic review (2024) confirmed significant association between maternal anemia and neonatal anemia - treating maternal IDA protects the neonate.
• Erythropoietin (PMID: 39087437): Systematic review found limited evidence supporting recombinant erythropoietin use in IDA in pregnancy; reserved for refractory cases.
• FIGO 2025 recommendations emphasize that treating anemia in pregnancy directly reduces postpartum hemorrhage (PPH) severity and mortality.