Glucose Tolerance Test (3 Specimens), plasma (Antenatal) [OGTT (3 samples for antenatal only)]

BC0146

Synonym(s):
Specimen Container
​Sodium fluoride tube (Adult)
Specimen Requirement
​Whole Blood
2 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.
Specimen Storage/Transport
OGTT timed specimens may be sent together or separately to the laboratory.
Orderable as Urgent? No
Turn Around Time
​Average 2 hrs (1 - 3 hrs)
Reference Value(s)

​GDM
Fasting glucose <= 5.0 mmol/L
1-hour glucose <= 9.9 mmol/L
2-hour glucose <= 8.4 mmol/L

Testing Laboratory Location KKH
Laboratory Clinical Chemistry
Contact Number 6394 1383
Day and Time Performed
​Mon to Fri: 0800 hr - 1730 hr
Sat: 0800 hr - 1230hr
Orderable on CPOE? Yes
Downtime Form

Clinical Chemistry - Form A

Additional Information

Critical Result:
OGTT (fasting) - > 10mmol/L
OGTT (2 hr) - > 15 mmol/L

Change History Notes

  • 19 Oct 2021 04:00 PM

    ​Updated Specimen Container, Specimen Requirement, Specimen Storage and Additional information.

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Last Updated - 05 Apr 2025