Insulin (Serum or Plasma) with 24-Hour Profile

Why This Test Is Done

Your doctor may order this test if you have diabetes and want to monitor how well your insulin levels fluctuate throughout the day. It can also help diagnose conditions like hypoglycemia (low blood sugar) or insulin resistance. Some people with unexplained weight changes, fatigue, or other symptoms may also need this test.

What to Expect Before the Test

You’ll typically provide a blood sample in a clinic or lab. The test involves drawing blood from a vein, usually in your arm. You may feel a small pinch, but it usually doesn’t cause much discomfort. If you’re taking insulin or other diabetes medications, let your healthcare provider know before the test.

What the Test Results Mean

Insulin levels vary naturally, especially in people with diabetes. A 24-hour profile helps track patterns, such as spikes or drops, that might indicate how well your body regulates blood sugar. Your doctor will compare these results with your symptoms and other test results to make a diagnosis or treatment plan.

Common Conditions Linked to This Test

This test is particularly useful for diagnosing or managing diabetes, including type 1 and type 2 diabetes. It may also help identify hypoglycemia, insulinoma (a rare tumor that causes high insulin levels), or other metabolic disorders affecting insulin production or function.