What Are Normal Insulin Levels

Blood insulin level is the primary controller of blood glucose levels and the normal range of insulin concentrations in the blood is 5 to 20 microU per mL under fasting conditions. A physician may request a blood insulin measurement in order to help diagnose any number of conditions. For example, high insulin levels are most often seen with insulin resistance, type 2 diabetes, obesity, and less frequently in acromegaly, Cushing's syndrome, and insulinomas. Insulin levels may not be measurable in type 1 diabetics and may be very low in patients having hypopituitarism or pancreatic diseases such as chronic pancreatitis or pancreatic cancer.

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