A 34-year-old woman is evaluated by the physician. Her vitals are normal. Laboratory studies are shown:
Hemoglobin 13 g/dL
Leukocytes 5,000/μL
Platelets 145,000/μL
Bleeding time 8 minutes
Prothrombin time 14 seconds
Partial thromboplastin time 37 seconds
Creatinine 1.2 mg/dL
Blood urea nitrogen 19 mg/dL
Which of the following is the most likely diagnosis?
