Biochemistry
| Full details for "Glucose Tolerance Test (Fast)". | |
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Name |
Glucose Tolerance Test (Fast) |
Alternative name/Profile |
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Department |
Biochemistry |
Investigation |
The oral glucose tolerance test is used to assess whether a patient can use and store glucose normally. It may be used in the diagnosis of diabetes mellitus, gestational diabetes, insulin resistance, reactive hypoglycaemia and acromegaly, amongst other conditions. Glucose levels may be checked fasting, at 1- and 2- hours post-glucose load depending on the clinical indication. |
Specimen type |
Fluoride EDTA Plasma |
Sample type |
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Sample container & volume |
4 mL Grey EDTA Fluoride tube |
Frequency of analysis |
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Turnaround time |
1 day |
Availability |
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Notes |
Fast for 10hrs overnight, water allowed. Three days of unrestricted diet and usual physical activity prior to OGTT. Smoking and strenous activities are not allowed during the test. Fasting Glucose 5.6 - 6.9: impaired fasting glycaemia. Fasting glucose > 6.9: Consistent with diabeted mellitis. |
Related links |
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Reference range |
3.5 - 5.5 |
Last updated |
Thu, 16 Oct 2025 15:41:16 IST |