Fasting Insulin (Ins)
Baseline insulin level. High fasting insulin is an early sign of insulin resistance, often before blood sugar rises.
Typical normal range
2–25 µIU/mL
If high ↑
Insulin resistance, metabolic syndrome, prediabetes, PCOS
If low ↓
Type 1 diabetes, hypoglycemia, low carbohydrate intake
What is a normal Fasting Insulin level?
A typical reference range is 2–25 µIU/mL. Ranges vary between laboratories and can depend on age and sex, so compare your result with the range printed on your own report.
What does a high Fasting Insulin level mean?
Insulin resistance, metabolic syndrome, prediabetes, PCOS. A single result rarely gives a diagnosis on its own; your doctor will interpret it alongside your symptoms and other tests.
What does a low Fasting Insulin level mean?
Type 1 diabetes, hypoglycemia, low carbohydrate intake. Your doctor will interpret it alongside your symptoms and other tests.
About the Diabetes Markers
These tests show how well your body controls blood sugar. They are used to screen for prediabetes and diabetes, and to monitor treatment over time.
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Medical disclaimer: Reference ranges vary by laboratory, age, sex, and clinical context. This page is for educational purposes only and is not a diagnosis. Always discuss your results with a qualified healthcare professional.