James Davis, MD

A 32-year-old man presents to the emergency department(ED) with generalized joint pain of several days'duration, which he believes is a sickle cell crisis similarto others he has had. He says that 4 to 6 mg of oralhydromorphone usually relieves the pain of these crises,but he recently ran out of his medication and is unableto contact his primary care physician because she ison vacation. He frequently interrupts to ask for a 6-mghydromorphone injection.

Which test--antistreptolysin O titers, coronary angiography, enzyme-linked immunosorbent assay (ELISA), Western blot testing for Borrelia burgdorferi, or genetic testing for long QT syndrome--would help you diagnose a young man with worsening chest pain, frontal headache, and diffuse muscle and joint pain?