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Also known as: Fasting Insulin
Formal name: Insulin, serum

At a Glance

Why Get Tested?

To help determine the cause of low blood glucose (hypoglycaemia), diagnose an insulinoma (insulin-producing tumour), and to help evaluate insulin production.

When to Get Tested?

If you have hypoglycaemia, if you have symptoms suggesting insulin is being inappropriately produced by your body, and rarely if you have diabetes and your doctor wants to monitor your insulin production

Sample Required?

A blood sample taken from a vein in your arm

Test Preparation Needed?

You may be asked to fast for 8 hours before the blood sample is collected, but occasionally a healthcare professional may do the test in very specific circumstances, for example, a glucose tolerance test. In some cases, a healthcare professional may request that you fast longer.