GLUCOSE TOLERANCE TEST, PLASMA (GTT) | Sengkang General Hospital

Lab Section Category

Clinical Biochemistry

Specimen Requirement

3 mL blood. Collect 2 timed specimens (Fasting and 2-hour Post Glucose Load)

Specimen Container

Sodium fluoride/potassium oxalate tube (Grey)

Turnaround Time

2 - 4 hours

Testing Laboratory

SKH

Reference Range / Interval

	Reference Range/Interval (mmol/L)
Baseline	≤ 6.0
120 mins	≤ 7.7

Orderable on CPOE?

Yes

Day and Time Performed

Daily, 24 hours

Additional Information

Oral GTT should be performed on the morning after at least 3 days of unrestricted diet and usual physical activity. Fast patient for 8-14 hours overnight. Collect 3 mL fasting blood specimen. Administer 75g anhydrous glucose in water orally over the course of 5 minutes. Patient should engage in minimal physical activity, no eating and no smoking after glucose is administered. Collect a second blood specimen 2 hours after the test load.

Back: Lab Catalogue

Last Updated - 12 Jun 2025