• Fasting Insulin
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Fasting Insulin

Fasting Insulin

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The Fasting Insulin test measures the level of insulin in your blood after an overnight fast. Insulin is a hormone that regulates blood sugar levels and plays a critical role in metabolism. Abnormal fasting insulin levels can indicate insulin resistance, which is a precursor to type 2 diabetes and metabolic syndrome. This test is important for understanding how well your body manages glucose and can help inform dietary and lifestyle changes to improve your metabolic health.

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About This Test

Reason to Check It

"Fasting insulin is the hormone released by your pancreas that helps remove glucose from your bloodstream and into your body’s cells where it can be used for fuel.  An insulin measurement may help determine whether a high glucose reading is the result of insufficient insulin production (as in insulin-dependent diabetes) or poor use of insulin (as in Type 2 Diabetes).  Elevated levels of insulin can indicate the beginning of Insulin Resistance Syndrome and is typically the first warning sign of potential overload of the pancreas.  

Insulin resistance leads to excess sugar in the blood stream, and over time this can lead to diabetes.  High levels of insulin increase cardiovascular risk by 1.5-2x in non-diabetics." - Dr. Alan Hopkins

Test Preparation

  • Fasting (Overnight) is recommended for 10-12 hours, but not required


Please Note: We recommend overnight fasting and an early morning blood draw for all tests, even if no special preparation is required. Remember, it is OK to drink plenty of water. Drinking water helps hydrate you and makes it easier for the phlebotomist to obtain your blood sample.

Test Type and Method

Test Type:

  • Blood


Test Method:

  • In-person Blood Draw

Post-Test Notes

  • Once your specimen is collected, test results are typically processed and available within a few business days. Processing times may vary depending on the test. Your results will be delivered in a clear, easy-to-understand report. If any values fall outside the expected range, you may receive a follow-up call from an independent healthcare coordinator.

Lab Testing is Simple, Fast, and Convenient

Choose the Individual Test or Lab Panel that suits your health needs. You’ll receive your lab requisition within 24 hours. Visit any of the 3,000+ Quest Diagnostics centers using the button below. Once your sample is collected, your results will be securely delivered via email within 7–10 days.

View Quest Draw Locations

Lab Testing is Simple, Fast, and Convenient

Choose the Individual Test or Lab Panel that suits your health needs. You’ll receive your lab requisition within 24 hours. Visit any of the 3,000+ Quest Diagnostics centers using the button below. Once your sample is collected, your results will be securely delivered via email within 7–10 days.

View Quest Draw Locations