GLUCOSE TOLERANCE TEST
Please note : Patient must phone collection centre in advance as an appointment is essential
Patients are tested for their ability to handle an oral glucose load taken in fasting state by measuring their plasma glucose 2-hours after ingestion.
Patient should be on their normal diet until the day of the test
The test is done at a time when the patient is free of acute illness
The test is performed between 0800 and 1000 after a 12-hour overnight fast. Water is permitted during the fasting period but eating, physical activity and smoking must be avoided
If fasting sample is less than 8mmol/L - proceed with the test
A 75g glucose load in the form of a single 285 mL bottle of chilled Dextrasol. The time and date of ingestion is noted.
Ingestion should be completed within 5 minutes.
Two more venous blood samples are taken at 1-hour intervals, starting exactly 1 hour after completion of ingestion.
Please contact laboratory on 9895 3471 for queries relating to GCT and GTT testing.
GROWTH HORMONE SUPRESSION TEST (OGTT with Growth Hormone/ IGF-1)
Take baseline samples of blood for IGF-1, glucose and GH.
Give bottle of 75 g glucose (or appropriate amount if paediatric patient) which should be drunk within 5 minutes.
Samples are collected at 30, 60, 90 and 120 minutes for glucose and Growth Hormone.
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