• Fasting Glucose
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Fasting Glucose

Fasting Glucose

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The Fasting Glucose test measures the level of glucose in your blood after an overnight fast. This test is crucial for assessing your body's ability to regulate blood sugar levels, which is essential for overall metabolic health. Abnormal fasting glucose levels can indicate insulin resistance or diabetes, which can lead to various health complications. Understanding your fasting glucose levels can help you and your healthcare provider make informed decisions about your diet, lifestyle, and potential interventions to improve your health.

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About This Test

Reason to Check It

"Historically, we have asked people to  fast for 8-12 hours and then we obtain a fasting plasma glucose (FPG). This has been considered the standard of care to detect diabetes and evaluate carbohydrate metabolism. Any FPG over 100mg/dL is associated with increased cardiovascular disease risk, but the actual diagnosis of diabetes is made after two FPG readings of ≥126 mg/dl. FPG levels between 100-126mg/dL are considered “pre-diabetes”, and this population has been known to develop microvascular and macrovascular complications over time. Optimal levels of fasting glucose are considered 70-85mg/dl." - 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