Insulin level after fasting.
General health information, not a diagnosis. In an emergency, call 102. Always consult a qualified health professional.
Fasting insulin is a test that measures the amount of insulin in the blood after a person has fasted for 8 to 12 hours. This test is used to evaluate low sugar levels or insulin resistance. If the fasting insulin level is high or positive, it suggests insulin resistance or excess insulin production. A low or negative fasting insulin level indicates low insulin production. This test is specific to laboratory results and should be interpreted by a qualified health worker. Results must be carefully considered as they may not be a definitive diagnosis.
Sources: SI health summary (own words); MedlinePlus Lab Tests and CDC as references
Selected investigations of low sugar or insulin resistance.
Fast 8 to 12 hours. Laboratory-specific; see the reference range on your report. High or positive may mean: Insulin resistance or insulin excess. Low or negative may mean: Low insulin production. General information, not a diagnosis. Results must be interpreted by a qualified health worker.
⚠️ Reference ranges vary by lab, age and sex — always use the range printed on your own report.
Consult a doctor to interpret results — a single test does not make a diagnosis.
Uses your location once to list the nearest facilities. Nothing is stored.
Why is Fasting insulin done?
Selected investigations of low sugar or insulin resistance.
Do I need to prepare or fast for Fasting insulin?
Fast 8 to 12 hours. Laboratory-specific; see the reference range on your report. High or positive may mean: Insulin resistance or insulin excess. Low or negative may mean: Low insulin production. General information, not a diagnosis. Results must be interpreted by a qualified health worker.
SI text CC BY 4.0; decoder reference data (cited per range); LOINC codes free with attribution (notice included).
Sources: SI health summary (own words); MedlinePlus Lab Tests and CDC as references