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