Whole Blood2 mL
The OGTT should be preceded by at least 3 days of adequate carbohydrate diet. It should be performed in the morning after the patient fasted at least 10 hours(but no longer than 16 hours). Adult: 75g load.
Invert blood 5 times after blood collection ensures the anticoagulant is well mixed with the blood. This will ensure results are reliable.
Fasting: <= 6.0 mmol/L 120 minutes: < 7.7 mmol/L
Fasting (mmol/L)Impaired fasting glucose (IFG) : 6.1 – 6.9 Impaired glucose tolerance (IGT) : < 7.0 Diabetes: >= 7.0
2-hour (mmol/L)Impaired fasting glucose (IFG) : < 7.8 (if measured) Impaired glucose tolerance (IGT) : 7.8 – 11.0 Diabetes: >= 11.1
Critical Result:OGTT (fasting) - > 10mmol/LOGTT (2 hr) - > 15
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