Insulin Resistance Testing: Fasting Insulin & Glucose Response

A fasting insulin test paired with fasting glucose is the most common starting point, because it shows how much insulin your body needs to hold glucose in range. Adding a two-specimen insulin response to glucose test or a glucose tolerance test gives a dynamic view of how your system handles an actual sugar load, which can surface changes a fasting draw alone may miss.

Yes, the body often compensates for declining insulin sensitivity by producing extra insulin, which can keep glucose and even HbA1c in the normal range for years. Elevated fasting insulin or an exaggerated insulin response to glucose are earlier markers associated with that compensation, and they are results to review with your doctor rather than a medical conclusion.

Yes, these tests are sold direct-to-consumer, so you can order online through the partner page and complete your blood draw at a local lab location without booking a doctor's appointment first. Results come to you, and flagged values are worth discussing with your physician.

No, direct-to-consumer lab testing is restricted or prohibited in New York, New Jersey, and Rhode Island, so residents of those states may be blocked at the partner's checkout. Residents of other states can typically order online and test at a nearby draw location.

Plan to fast, typically 8 to 12 hours with water permitted, before fasting insulin, fasting glucose, and glucose tolerance testing. The two-specimen tests also involve a timed second draw after you drink a standardized glucose solution, so allow extra time at the lab and follow the preparation instructions provided when you order.