Test guide
Insulin in Blood Test
An insulin in blood test measures the amount of insulin in a sample of your blood. Insulin is a hormone that your pancreas makes. Hormones are chemical messengers in your bloodstream that control the actions of certain cells or organs.
What it is for
An insulin in blood test may be used with other tests to help: In many cases, your provider will use other tests along with an insulin in blood test. The most common of these are: Source: MedlinePlus, National Library of Medicine. Medical test information is public domain. Source identity and definition checked automatically on 2026-10-18. No individual clinical interpretation or human reviewer is asserted.
Limitations
Reference intervals and interpretation depend on the laboratory, specimen, method and clinical context. This source definition is educational information; it does not establish a diagnosis, product approval or suitability for an individual.
Also known as
- fasting insulin, insulin serum, total and free insulin
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