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Glucose Testing and Interpretation

TestResultDiagnosis
Fasting plasma glucose, mg/dL
(8 hours without caloric intake)
≤99Normal
100-125Impaired fasting glucose
≥126Diabetes, confirmed by repeating the test on a different day
Glucose, mg/dL
(oral glucose tolerance test 2 hours
after ingestion of 75-g glucose load)
≤139Normal
140-199Impaired glucose tolerance
≥200Diabetes, confirmed by repeating the test on a different day
Hemoglobin A1c, %
(as a screening test)
<5.7Normal
5.7-6.4High risk/prediabetes; requires screening by glucose criteria
≥6.5Diabetes, confirmed by repeating the test on a different day

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