Oral Glucose + Insulin Tolerance Test over 2 hours (3 Specimens) (OGTT)

Fasting Glucose measures blood sugar levels after an overnight fast (typically 8-12 hours). It reflects baseline glucose regulation. While standard guidelines define diabetes risk based on thresholds (e.g., prediabetes 100-125 mg/dL, diabetes ≥126 mg/dL), longevity experts emphasize maintaining levels in a tighter, lower optimal range (e.g., 70-90 mg/dL) for better metabolic health, reduced glycation, and potentially lower risk of age-related diseases. Continuous Glucose Monitoring (CGM) provides much richer data on glucose variability and post-meal responses.

Glucose measured one hour after a standardized glucose load during an oral glucose tolerance test (OGTT). Interpreted against the IDF 2024 position statement: below 155 mg/dL is within range, 155–208 is above the expected range, and 209 or higher meets the threshold for confirmatory testing.

Glucose measured two hours after a standardized glucose load during an oral glucose tolerance test (OGTT). Interpreted against the ADA diagnostic criteria: below 140 mg/dL is within range, 140–199 is above the expected range, and 200 or higher meets the threshold for confirmatory testing.

Fasting Insulin measures the level of insulin hormone after an overnight fast. Insulin regulates blood glucose uptake into cells. Elevated fasting insulin (hyperinsulinemia) is an early sign of insulin resistance, often preceding elevations in glucose or HbA1c. Maintaining low fasting insulin levels is crucial for metabolic health and longevity. Note: Results are highly unreliable if not measured in a truly fasted state (8-12 hours).

Insulin measured one hour after a standardized glucose load during an oral glucose tolerance test (OGTT). Post-load insulin has no externally validated interpretation threshold, so the value is shown as measured.

Insulin measured two hours after a standardized glucose load during an oral glucose tolerance test (OGTT). Post-load insulin has no externally validated interpretation threshold, so the value is shown as measured.