Blood Glucose Levels

Normal Blood Glucose
  Laboratory Value
Fasting Plasma glucose < 100 mg/dL
Oral Glucose Tolerance Test* < 140mg/dL
A1C (for people without diabetes) 4% to 6%
Diagnosis of Diabetes Mellitus
  Laboratory Value
† Symptoms (eg, hyperglycemia, excessive thirst, frequent urination, polyphagia)
Fasting Plasma Glucose ≥ 126 mg/dL
Nonfasting Plasma Glucose ≥ 200 mg/dL with symptoms †
Oral Glucose Tolerance Test ≥ 200 mg/dL
Diagnosis of Impaired Glucose Tolerance or Prediabetes
  Laboratory Value
* Plasma glucose level measured two hours after an oral glucose tolerance test.
Impaired Fasting Glucose 100 to 125 mg/dL
Impaired Oral glucose Tolerance test* 140 to 199 mg/dL