Serum Insulin with 24-Hour Quantification (or 'Insulin Profile')

Why This Test Is Done

Your doctor may order this test if you have symptoms of low or high blood sugar, unexplained weight changes, frequent urination, fatigue, or if you have a family history of diabetes or metabolic disorders. It may also be used to evaluate how well your body responds to insulin therapy or to check for conditions like Cushing’s syndrome or hyperinsulinism.

What to Expect Before the Test

No special preparation is needed for this test. You may have a simple blood draw from a vein in your arm, and the sample is sent to a lab for analysis. If you’re taking insulin therapy, discuss your medication schedule with your healthcare provider before the test.

What the Test Measures

This test measures the concentration of insulin in your blood over 24 hours. Insulin is a hormone produced by your pancreas that helps regulate blood sugar levels. The test helps determine if your body is producing enough insulin or if there are fluctuations in its levels throughout the day.

How the Results Are Used

The results help your doctor understand how your body manages blood sugar, whether you have insulin resistance, or if your current treatment plan is effective. Abnormal results may indicate conditions like diabetes, hypoglycemia, or other metabolic disorders that require further evaluation.