system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 28-year-old gravida-2-para-1 at 12 weeks gestation presents for a prenatal visit. Over the past week, she has felt increasingly tired, even after waking up in the morning. She is vegan and avoids all animal products. She was diagnosed with Graves’ disease 6 months ago. Before conception, methimazole was switched to propylthiouracil (PTU). Other medications include folic acid and a multivitamin. The vital signs include: temperature 37.1℃ (98.8℉), pulse 72/min, respiratory rate 12/min, and blood pressure 110/75 mm Hg. The conjunctivae and nail beds are pale. Petechiae are present over the distal lower extremities. The pelvic examination reveals a uterus consistent in size with a 12-week gestation. Examination of the neck, lungs, heart, and abdomen shows no abnormalities. The laboratory studies show the following:
Laboratory test
Hemoglobin 9.0 g/dL
Mean corpuscular volume 90 μm3
Leukocyte count 4,000/mm3
Segmented neutrophils 55%
Lymphocytes 40%
Platelet count 110,000/mm3
Serum
Thyroid-stimulating hormone 0.1 μU/mL
Thyroxine (T-4) 8 μg/dL
Lactate dehydrogenase 60 U/L
Total bilirubin 0.5 mg/dL
Iron 100 μg/dL
Ferritin 110 ng/mL
Total iron-binding capacity 250 μg/dL
Which of the following best explains these findings?
assistant
Drug-induced marrow failure