Interpretation of OGTT Results
Fasting plasma glucose (measured before the OGTT begins) should be below 6.1 mmol/L (110 mg/dL). Fasting levels between 6.1 and 7.0 mmol/L (110 and 125 mg/dL) are borderline ("impaired fasting glycaemia"), and fasting levels repeatedly at or above 7.0 mmol/L (126 mg/dL) are diagnostic of diabetes.
The 2 hour OGTT glucose level should be below 7.8 mmol/L (140 mg/dL). Levels between this and 11.1 mmol/L (200 mg/dL) indicate "impaired glucose tolerance". Glucose levels above 11.1 mmol/L (200 mg/dL) at 2 hours confirms a diagnosis of diabetes.
| Glucose levels | NORMAL | impaired fasting glycaemia (IFG) | impaired glucose tolerance (IGT) | Diabetes Mellitus (DM) | ||||
|---|---|---|---|---|---|---|---|---|
| Venous Plasma | Fasting | 2hrs | Fasting | 2hrs | Fasting | 2hrs | Fasting | 2hrs |
| (mmol/L) | <6.1 | <7.8 | > 6.1 & <7.0 | <7.8 | <7.0 | >7.8 | >7.0 | >11.1 |
| (mg/dL) | <110 | <140 | >110 & <126 | <140 | <126 | >140 | >126 | >200 |
Impaired glucose tolerance is often associated with insulin resistance and is often seen in Polycystic Ovary Syndrome.
Read more about this topic: Glucose Tolerance Test
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