A 50-year-old male with a family history of diabetes visits his physician for routine physical. He reports that he feels his health is excellent. He exercises regularly, but often his diet is high in calories and fat.
Physical Examination: Slightly overweight; blood pressure and pulse normal.
A basic metabolic panel and PSA are ordered. All results are within the normal reference intervals except the plasma glucose.
Fasting plasma glucose (FPG)= 110 mg/dL (reference interval 75 - 100 mg/dL)
One week later:
The patient's physician orders a Hb A1C
Hb A1C= 6.0% (reference interval 4 - 6%)