Insulin, Serum or Plasma Concentration (Quantitative Measurement)

Why Is This Test Done?

Your healthcare provider may order this test to check for insulin-related disorders, such as hypoglycemia (low blood sugar), insulin resistance, or to evaluate how your body responds to insulin. It may also be used in diagnosing conditions like type 1 or type 2 diabetes, especially when oral glucose tolerance tests or other blood sugar tests are inconclusive.

What Does the Test Involve?

A blood sample is taken from a vein, usually in your arm. You may feel a small pinch when the needle is inserted, but the procedure is quick. The sample is then sent to a lab for analysis using a specialized immunoassay method to measure insulin concentration.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for a few hours before the test if it’s part of a broader glucose-related evaluation. Always follow your healthcare provider’s instructions.

What Are Common Results Used For?

Results help determine if your insulin levels are too high or too low, which can indicate conditions like diabetes, hypoglycemia, or other metabolic issues. High insulin levels might suggest insulinoma (a rare tumor) or Cushing’s syndrome. Low levels could point to diabetes, adrenal insufficiency, or other hormonal imbalances.