A serum alkaline phosphatase (ALP) level three times higher than normal, found on routine laboratory examination, prompted further evaluation of a 57-year-old man. At admission, his temperature was 36.8°C (98.2°F), blood pressure was 120/85 mm Hg, pulse rate was 90 beats per minute, and respiration rate was 19 breaths per minute. The physical examination was unrevealing, and the patient's personal and family medical histories were unremarkable.
