The patient has eruptive xanthomas and diabetes mellitus . At the time of this office visit , a finger-stick glucose value was 232mg/dl and urinalysis revealed +++ glucose and no ketones. Laboratory evaluation after fasting the next day revealed a triglyceride concentration of 1324 mg/dl and a total cholesterol concentration of 315mg/dl. High density lipoprotein concentrations were measured as 32mg/dl and there were no chylomicrons present. The very high concentration of triglyceride confirms the diagnosis, and a skin biopsy is not needed.