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About the test
What is this test done for?
Insulin is a hormone which is produced by the beta cells of pancreas. The insulin helps in transporting the glucose from the blood to the cells. Thus, the test is performed to check if the insulin levels in the blood are within the range.
Why is it Done?

The test is done to detect the following conditions:

  • Insulinoma- a tumour of the insulin producing cells of pancreas
  • Cause of hypoglycaemia
  • In type 2 diabetes treatment, to assess the need of insulin along with oral supplements.
  • To monitor the level of improvement in a diabetic patient.
When should it be performed?

The test should be done when the following symptoms or disease conditions are present:

  • Excessive sweating
  • Intolerable hunger
  • Confusion
  • Dizziness
  • Fainting spells
  • Insulin resistance- PCOS, pre diabetes, metabolic syndrome.
  • Obesity
  • Infertility due to PCOS
How is it done
A blood sample will be collected from a vein in your arm. The person getting tested should fast for minimum 8 hours before the test.
The normal value is less than 25 mIU/L.
  • Positive results could mean— metabolic syndrome like acromegaly, Cushing syndrome, insulomas, obesity, PCOS, drugs like corticosteroids or oral contraceptives, type 2 diabetes.
  • Negative results could mean— Diabetes, hypopituitarism, chronic pancreatitis, pancreatic cancer.
Other Tests
C-peptide test can be done along with Insulin fasting to confirm whether endogenous or exogenous formation of insulin.
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