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Glucose and Diabetes
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Currently under review
Pending specialist review and validation.
Insulin is a hormone made by the beta cells of your pancreas that helps move glucose from your bloodstream into your cells for energy and storage. The insulin test measures how much insulin is circulating in your blood at the time of the sample.
It is often collected after an overnight fast and may be paired with glucose, C‑peptide, and other markers to understand how your body produces and uses insulin. Clinicians may also check insulin during evaluation of low blood sugar symptoms or in specific protocols that assess insulin production and action.
Insulin levels provide clues about insulin resistance, metabolic health, and how well the pancreas is working. Higher levels can indicate that your body is working harder to keep glucose controlled, while lower levels can suggest reduced insulin production.
Your clinician may order this test when investigating symptoms of low blood sugar, assessing risk related to metabolic syndrome or polycystic ovary syndrome, monitoring response to lifestyle or medications that affect insulin sensitivity, or when an insulin‑secreting tumor is suspected. Results help guide next steps in prevention and treatment.
Your result is interpreted together with your glucose level, symptoms, medical history, and medicines. A higher value in a fasting sample may point to insulin resistance, but recent food, stress, or certain drugs can also raise insulin temporarily. A lower value despite high glucose may suggest inadequate insulin production.
If a result does not fit your clinical picture, your clinician may repeat testing under strict fasting conditions or order related tests such as C‑peptide, proinsulin, and diabetes autoantibodies. Follow‑up typically focuses on the underlying cause, which can include nutrition and activity changes, adjusting medicines, and evaluating for endocrine, liver, kidney, or pancreatic conditions.
Reference intervals vary by laboratory, analyzer, methodology, population, and units. The ranges shown here are for education only. Always interpret your results against the reference interval printed on your own lab report.
Eating or drinking calories shortly before the blood draw increases insulin and can mask underlying insulin resistance or deficiency. Follow the fasting instructions provided by your lab or clinician.
Time of day, recent exercise, acute illness, pain, or psychological stress can alter insulin through shifts in stress hormones, sometimes producing transient changes in results.
Insulin injections, sulfonylureas, meglitinides, GLP‑1 receptor agonists, corticosteroids, thiazide diuretics, beta‑blockers, and some antipsychotics can raise or lower measured insulin. Always list your medicines before testing.
Insulin is a peptide that can degrade if a sample is not processed promptly. Delays in separation, improper storage, or assay interferences may lead to misleading results.
Kidneys help clear insulin and the liver metabolizes it. Chronic kidney disease or liver disease can elevate or lower insulin independently of pancreatic production.
Higher body fat, pregnancy, and conditions like polycystic ovary syndrome increase insulin needs and may raise fasting insulin. Puberty and thyroid disorders can also influence results.
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