Fasting Insulin
What it is
Fasting insulin measures how much insulin your pancreas is producing to keep your blood sugar in a normal range after an overnight fast.
Why it matters
Glucose is often the last number to move in the development of insulin resistance. Years before fasting glucose or HbA1c cross into prediabetic territory, the pancreas frequently compensates by producing more and more insulin to hold glucose steady, a phase a standard glucose test can't see because it's specifically designed to look normal. Fasting insulin is one of the earliest measurable signs that this compensation is happening, which is why it's typically read alongside glucose rather than instead of it: a normal glucose result with an elevated insulin result tells a very different story than a normal result on both.
Fasting Insulin is one of the markers in Zaro's Surface panel and every tier above it.
This information is for educational purposes and is not a substitute for professional medical advice. Always talk to a physician about your specific results and health history.
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