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Insulin Fasting Blood Insulin is a hormone produced by the beta cells in the pancreas. Insulin helps in absorption of glucose (sugar) from the bloodstream into the cells of the body. In these cells, glucose is used for the production of energy, which is utilized by the body. In healthy individuals, insulin production is high when the glucose levels in the blood are high and insulin production is low when the glucose levels in the blood are low.

Insulin maintains blood glucose levels and prevents hypoglycemia (low blood sugar levels) as well as hyperglycemia (high blood sugar levels). Insulin converts the excess sugar in the blood into glycogen for storage.


Inform your doctor if you are on any medications, have any allergies or underlying medical conditions before your Insulin Fasting. Your doctor will give specific instructions depending on your condition on how to prepare for Insulin Fasting.

Fasting Insulin test is done after you have fasted (without eating or drinking anything) for a whole night or for 8 to 12 hours. Usually, the blood is drawn in the morning after an overnight fast.

Result explanation

If the test result falls within the normal reference range, then the insulin production is normal and you may not need further medical intervention.

Increased levels of insulin may be due to obesity, insulinoma, type-2 diabetes mellitus, infantile hypoglycemia, hyperinsulinism (increase in the insulin levels than the normal range), Cushing?s syndrome (pink and purple stretch marks along with round face and large tummy), acromegaly (enlargement of the face, hand, and feet), hyperthyroidism (excess production of hormones from thyroid gland), insulin resistance, etc.

Decreased levels of insulin may indicate hypopituitarism (decrease in hormone production by the pituitary gland), Type-1 diabetes mellitus, cystic fibrosis, pancreatitis (inflammation in the pancreas), pancreatic cancer, etc.

Gender Age groups Value

OTHER All age groups < 225mIU/L

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