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Insulin

Formal name: Insulin
Related tests: C-Peptide, Glucose, Glucose Tolerance Test (GTT)

Why should I do it?
To help evaluate insulin production, diagnose an insulinoma, and to help determine the cause of hypoglycemia

When should I do it?
When you have documented hypoglycemia; when you have symptoms suggesting insulin either is being inappropriately released or utilized by your body; when you have diabetes and your doctor wants to monitor your insulin production; sometimes to document insulin resistance

What Kind of Sample is Needed?
A blood sample drawn from a vein in your arm

Test Preparation Needed?
You may be asked to fast for 8 hours before the blood sample is collected; occasionally your doctor may do the test at other times, such as when a glucose tolerance test is done. In some cases, your doctor may request that you fast longer.