What are the FOGSI-recommended screening and management strategies for anemia in pregnancy?

FOGSI Anemia Management in Pregnancy

Screening Recommendations

Screen all pregnant women for anemia at booking (first prenatal visit) and again at 28 weeks of pregnancy using a full blood count (FBC), or hemoglobin/hematocrit measurement where FBC is unavailable 1. While the provided evidence does not contain specific FOGSI guidelines, the most recent high-quality international guidance from FIGO (2025) provides the current standard of care that aligns with major obstetric societies.

Diagnostic Thresholds

• Hemoglobin <11 g/dL in all trimesters defines anemia in pregnancy 1
• This single cutoff applies universally across all trimesters, populations, and settings
• Note: Some sources use <10.5 g/dL for second/third trimester, but the most recent FIGO guideline standardizes at <11 g/dL 2

Risk Factors to Identify

Pregnant women at higher risk include those with:

• Dietary factors: Vegetarian diet without adequate iron sources, diet lacking iron-rich foods
• Gastrointestinal issues: Conditions or medications (antacids) that decrease iron absorption
• Reproductive factors: Short interpregnancy interval, parity ≥2
• Demographic factors: Non-Hispanic Black and Mexican American women have higher prevalence 3

Management Algorithm

Step 1: Initial Evaluation When Anemia Detected

Mild anemia (Hb 10.0-10.9 g/dL) with normal/mildly low MCV:

• Presumptive iron deficiency anemia
• Begin oral iron supplementation (diagnostic and therapeutic trial) 2

Moderate anemia (Hb 7.0-9.9 g/dL), severe anemia (Hb 4.0-6.9 g/dL), very low MCV, or macrocytic anemia:

• Requires further investigation with iron studies before treatment 2
• Consider hemoglobinopathy screening in appropriate populations 1

Step 2: Prevention and Treatment

Universal Prophylaxis:

• All pregnant women should receive routine iron and folic acid supplementation throughout pregnancy 1
• Standard dose: 30 mg elemental iron daily in early pregnancy 3
• Higher-risk populations: 60-100 mg elemental iron daily 3
• Multiple micronutrient supplements are an acceptable alternative 1

Treatment of Confirmed Iron Deficiency Anemia:

First-line: Oral Iron

• Dose: 60-120 mg elemental iron daily 3, 2
• Emerging evidence supports intermittent dosing (not daily) as equally effective with fewer side effects 2
• Common side effects: GI symptoms, dark stool/urine, teeth staining, drug interactions 3

Second-line: Intravenous Iron

• Indicated when oral iron is:
  • Not tolerated
  • Not absorbed
  • Not effective 2
• Contemporary IV iron formulations have rare allergic reactions 2
• Expedites treatment and improves adherence 4

Step 3: Monitoring After Treatment

• Recheck hemoglobin to assess response to therapy
• Continue monitoring through delivery and postpartum period (same <11 g/dL threshold applies postpartum) 1

Critical Clinical Considerations

Timing Matters:

• Early pregnancy anemia may be associated with serious adverse infant outcomes
• Third trimester anemia shows less consistent association with adverse outcomes 5
• This underscores the importance of early detection and treatment

Relationship to Postpartum Hemorrhage:

• Anemia significantly increases maternal mortality risk and PPH complications 1
• Anemic women have higher likelihood of requiring blood transfusion at delivery 2

Special Populations:

• Hemoglobinopathies: Require screening, specialized supplementation protocols, and potential transfusion 1
• Malaria-endemic areas: Add malaria chemoprophylaxis 1
• Helminth-endemic areas: Consider anti-helminthic treatment 1

Common Pitfalls to Avoid

1. Don't wait for severe anemia: Screen early and treat promptly
2. Don't assume all anemia is iron deficiency: Very low MCV, macrocytic anemia, or moderate-to-severe anemia requires investigation before empiric treatment
3. Don't overlook adherence: GI side effects from oral iron are common; consider intermittent dosing or IV iron if adherence is poor
4. Don't forget postpartum screening: The same hemoglobin threshold (<11 g/dL) applies postpartum

Evidence Limitations

The USPSTF (2015) found insufficient evidence to recommend for or against routine screening or supplementation in well-nourished populations [5-5]. However, ACOG, CDC, Institute of Medicine, and FIGO all recommend universal screening and supplementation 5, 1, reflecting the clinical consensus that the potential benefits outweigh theoretical harms, particularly given anemia's contribution to 115,000 maternal deaths annually worldwide 1.