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Fitness Testing > Tests > Health > Glucose Tolerance Test (GTT)

Oral Glucose Tolerance Test (GTT)

  • monitoring blood measuresaim: A glucose tolerance test determines how quickly glucose is cleared from the blood. The test is usually used to test for diabetes and insulin resistance.

  • equipment required: blood glucose analyzer, blood collection apparatus, glucose, scales.

  • description / procedure: The test is performed immediately following a fast of between 8-16 hours. A fasting blood glucose measurement is performed immediately prior to the test. If this level is greater than 7.0 mmol/L, the test is usually not performed as this level signifies diabetes mellitus. The patient is then given a glucose solution to drink. Adults are given 75 grams of glucose, children are given an amount dependent on their weight: 1.75 g/kg body weight (up to 75 grams maximum). The patient is instructed to rest, then another blood glucose measurement is taken after 2 hours.

  • results:

Rating

Fasting

2 Hour

Normal

< 5.5 mmol/L

< 7.8 mmol/L

Impaired glucose tolerance

< 5.5 mmol/L

7.8 - 11.0 mmol/L

Impaired fasting glycemia

5.5 - 6.9 mmol/L

< 7.8 mmol/L

Diabetes mellitus:

> 7.0 mmol/L

> 11.1 mmol/L

  • contraindications: the GTT should not be done if the patient is ill, is known to have diabetes mellitus, or has symptoms suggestive of diabetes mellitus (e.g. fasting plasma glucose >7.0 mmol/L or random plasma glucose >11.1 mmol/L.

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