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 62-year-old man presents to the emergency department with a 2-day history of fatigue, exertional dyspnea, and the sensation of his heartbeat roaring in the ears. He informs you that he recently had an acute upper respiratory infection. He is a retired car salesman, and he informs you that he and his partner enjoy traveling to the tropics. His medical history is significant for gout, hypertension, hypercholesterolemia, diabetes mellitus type II, and multiple basal cell carcinomas on his face and neck. He currently smokes 1 pack of cigarettes per day, drinks a 6-pack of beer per day, and denies any illicit drug use. His vital signs include: temperature 36.7°C (98.0°F), blood pressure 126/74 mm Hg, heart rate 111/min, and respiratory rate 23/min. On physical examination, his pulses are bounding, his complexion is pale, and scleral icterus is apparent. The spleen is moderately enlarged. Oxygen saturation was initially 81% on room air, with a new oxygen requirement of 8 L by face mask. Laboratory analysis results show a hemoglobin level of 7.1 g/dL and elevated total bilirubin. Of the following options, which laboratory test can help to make the diagnosis?
assistant
Direct Coombs Test