R U H Bath, return to home page

Pathology Departments Requesting & Reporting Blood Test Information Phlebotomy Guide Contact us
Blood Sciences

Blood Test Information

Glucose Tolerance Test
(a.k.a GTT)
minimum sample volume required ~ 2.5ml

  back to assay index

Tube type: Fluoride

Special instructions
Fasting & 2Hr post glucose

Reference range

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.

» Diagnosis of Diabetes Mellitus


back to top