A 31-year-old woman, G1P0, at 11 weeks’ gestation comes to the obstetrician for antenatal screening. Laboratory studies show an MCV of 76 fL and a hemoglobin of 10 g/dL. Three weeks ago, her MCV was 75 fL and hemoglobin 10 g/dL. She takes no medications apart from a pregnancy multivitamin which she started 3 weeks ago. Which of the following is the next best step in management?
α-globin DNA testing
β-globin DNA testing
Erythropoietin therapy
Hemoglobin electrophoresis
Parenteral iron therapy
