A 14-year-old male sees his pediatrician because of fatigue, weight loss, increased appetite, thirst, and frequent urination. There is a family history of diabetes. The physician orders the following laboratory assays and review the results as follows:
Fasting plasma glucose (FPG) = 250 mg/dL (reference interval 75 - 100 mg/dL)
Serum ketones = Positive, 1+ (reference = Negative)
One week later:
FPG repeated = 170 mg/dL (reference interval 75 - 100 mg/dL)