Glucose Tests

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Also known as: Blood sugar; Fasting blood sugar; blood glucose; Oral Glucose Tolerance Test (OGTT or GTT); urine glucose
Formal name: Blood Glucose; Urine Glucose

At a Glance

Why Get Tested?

To determine whether or not your blood glucose level is within normal ranges; to screen for, diagnose, and monitor diabetes, and to monitor for the presence of  hypoglycaemia (low blood glucose) and hyperglycaemia (high blood glucose)

When to Get Tested?

If you have symptoms suggesting hypoglycaemia or hyperglycaemia, or if you are pregnant. If you have diabetes, you may be required to monitor glucose levels several times a day using a self-monitoring device.

Sample Required?

A blood sample taken from a vein in your arm, or for a self monitoring, a drop of blood from your finger. A few diabetic patients may use a continuous glucose monitor which is a small sensor wire inserted beneath the skin of the abdomen that measures blood glucose every five minutes.

Note: In general, it is recommended that you fast at least 8 hours before having a blood glucose test. However, people with diabetes are often required to have their glucose levels checked both while fasting and after meals to provide the best control of their diabetes.

Test Preparation Needed?

In general, it is recommended that you fast (nothing to eat or drink except water) for at least 8 hours (generally 8-10 hours fast) before having a blood glucose test performed. For people with diabetes, glucose levels are often checked both while fasting and after meals to provide the best control of diabetes. For random, timed, and post-meal glucose tests, follow your healthcare professionals instructions.