An otherwise healthy 26-year-old woman has had petechiae on her legs during the last 24 hours. Laboratory studies show: Hemoglobin 13.1 g/dL Hematocrit 39.7% Leukocyte count 8500/mm3 Neutrophils
A 30-year-old woman whose mother and grandmother have died of carcinoma of the breast refuses to have mammography. She says that she knows she is at risk but
Warfarin is administered to a 56-year-old man following placement of a prosthetic cardiac valve. The warfarin dosage is adjusted to maintain an INR of 2.5. Subsequently,trimethoprim-sulfamethoxazole therapy is
A 10-month-old girl is brought to the physician because of a 2-day history of diarrhea. She can sit unassisted and has started to crawl. Her mother is concerned
A 32-year-old man with non-Hodgkin lymphoma comes to the physician 6 days after finishing the initial chemotherapy regimen. His leukocyte count is 1600/mm3, indicating greater bone marrow suppression
A 20-year-old woman comes to the physician because of a 5-year history of increasingly severe, unilateral, throbbing headaches. The headaches, which are associated with nausea and occasional vomiting,
A 26-year-old man with HIV infection comes to the physician for a follow-up examination. Six months ago, he had an acute infection characterized by jaundice. Current medications include
A 58-year-old woman comes to the physician because of intermittent vaginal bleeding during the past 3 months. She has been treated with tamoxifen since having a partial mastectomy
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