The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 23-year-old primigravida presents for a regular prenatal care visit at 16 weeks gestation. She complains of increased fatigability, but is otherwise well. She takes folic acid, iron, and vitamin D supplementation. Her vital signs are as follows: blood pressure, 110/70 mm Hg; heart rate, 86/min; respiratory rate, 13/min; and temperature, 36.6℃ (97.9℉). The physical examination is unremarkable. The complete blood count results are as below: Erythrocyte count 3.9 million/mm3 Hb 11.1 g/dL HCT 32% Reticulocyte count 0.2% MCV 90 fL Platelet count 210,000/mm3 Leukocyte count 8,100/mm3 Which of the following tests is required to investigate the cause of the patient’s laboratory findings?   (A) Serum iron level   (B) Serum B12 level   (C) Transferrin   (D) No tests required
['(D) No tests required <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Serum iron level \n (B) Serum B12 level \n (C) Transferrin \n (D) No tests required <> possible answers', '  A 23-year-old primigravida presents for a regular prenatal care visit at 16 weeks gestation. She complains of increased fatigability, but is otherwise well. She takes folic acid, iron, and vitamin D supplementation. Her vital signs are as follows: blood pressure, 110/70 mm Hg; heart rate, 86/min; respiratory rate, 13/min; and temperature, 36.6℃ (97.9℉). The physical examination is unremarkable. The complete blood count results are as below:\nErythrocyte count 3.9 million/mm3\nHb 11.1 g/dL\nHCT 32%\nReticulocyte count 0.2%\nMCV 90 fL\nPlatelet count 210,000/mm3\nLeukocyte count 8,100/mm3\nWhich of the following tests is required to investigate the cause of the patient’s laboratory findings? <> context@']