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Oral Glucose Tolerance Test, 2-Hour Glucose
Abbreviation: OGTT
Panel: Diabetes Tests · All diabetes tests
Typical adult reference range
| Conventional units | <140 mg/dL |
| SI units | <7.8 mmol/L |
Ranges vary between laboratories and methods — compare your result with the range printed on your own report.
What a high or low result can mean
High oral glucose tolerance test, 2-hour glucose: high values can be seen in impaired glucose tolerance and diabetes mellitus.
These are associations, not a diagnosis: the same result can have several causes, and your clinician interprets it with the rest of your results and history.
Good to know
Measured 2 hours after a standard 75 g oral glucose load following an overnight fast.
Related tests — Diabetes Tests
Please note: Reference ranges vary between laboratories, and between the methods and instruments they use — the range printed on your own report is the one your result should be compared with. A result outside the range is not by itself a diagnosis, and a result inside it does not rule out illness. These pages are an educational summary, not medical advice: always discuss your results with the clinician who ordered them, who can interpret them in the context of your health and history.