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Glucose Tolerance Test
(a.k.a GTT)
minimum sample volume required ~ 2.5ml
Tube type: Fluoride
Special instructions
Fasting & 2Hr post glucose
Reference range
n/a
Turnaround Time
1
day
Department: Biochemistry
Clinical Application
GTT is recommended in patients with impaired fasting glycaemia, but need not be undertaken if a clearly raised fasting glucose (>7.0 mmol/l) has already been shown: in this case diabetes may be diagnosed on the basis of clinical signs, or by a repeat fasting glucose. Undertaking a GTT if fasting glucose is known to be raised may be dangerous.
