Repeat the fasting plasma glucose test at another time.
According to the new American Diabetes Association criteria for the diagnosis of diabetes mellitus, a patient is considered to have the disease when (1) the fasting plasma glucose level is at least 126 mg/dL on 2 separate occasions; (2) a random plasma glucose level is above 200 mg/dL (regardless of the elapsed time since the patient’s last meal), and the patient has symptoms of diabetes mellitus (eg, polyuria, polydipsia); or (3) the 2-hour plasma glucose level during an oral glucose tolerance test is greater than or equal to 200 mg/dL.
