Management of Anemia in Pregnant Women

Initial Screening and Diagnosis

All pregnant women should receive 30 mg/day of oral elemental iron starting at the first prenatal visit, and if anemia is detected, increase to 60-120 mg/day of elemental iron immediately without waiting for additional testing, as recommended by the American College of Obstetricians and Gynecologists 1, 2, 3
Screen all pregnant women for anemia at the first prenatal visit using hemoglobin or hematocrit measurement, with anemia in the first trimester defined as hemoglobin <11.0 g/dL, according to the American College of Obstetricians and Gynecologists 2, 3
The prevalence of iron deficiency in the first trimester is approximately 6.9%, making it the most common cause of anemia during this period, as reported by the Annals of Internal Medicine 4, 5

Mild anemia is defined as hemoglobin 10.0-10.9 g/dL in the first trimester, moderate anemia as hemoglobin 7.0-9.9 g/dL, and severe anemia as hemoglobin <7.0 g/dL, as classified by the American College of Obstetricians and Gynecologists 1

Prescribe 60-120 mg/day of elemental iron orally as first-line treatment for mild anemia, as recommended by the American College of Obstetricians and Gynecologists 1, 2, 3
Counsel patients to take iron between meals to maximize absorption, though taking with food may improve tolerability if gastrointestinal side effects are problematic, according to the American College of Obstetricians and Gynecologists 2
Consider adding vitamin C to enhance iron absorption, though evidence is limited, as suggested by the American College of Obstetricians and Gynecologists 2
Provide dietary counseling on iron-rich foods, including meat, poultry, iron-fortified grain products, and certain fruits and vegetables, as recommended by the American College of Obstetricians and Gynecologists 2, 3

Reassess hemoglobin after 4 weeks of treatment, expecting an increase of ≥1 g/dL or hematocrit increase of ≥3%, as recommended by the American College of Obstetricians and Gynecologists 2, 3
If no response occurs after 4 weeks, perform additional testing including MCV, RDW, and serum ferritin, according to the American College of Obstetricians and Gynecologists 2, 3

Vegetarian women may require nearly double the iron supplementation due to lower absorption of non-heme iron from plant sources, as reported by the American College of Obstetricians and Gynecologists 3
Early pregnancy anemia is associated with a twofold increased risk for preterm delivery and threefold increased risk for low birthweight babies, making early detection and treatment particularly important, as reported by the MMWR Recommendations and Reports 6