Test Details & Preparation
- Fasting Insulin test is done to help evaluate insulin production by the beta cells in the pancreas to help diagnose the presence of an insulin-producing tumour in the islet cells of the pancreas (insulinoma) to help determine the cause of low blood glucose (hypoglycaemia) to help identify insulin resistance, or to help determine when a type 2 diabetic might need to start taking insulin to supplement oral medications.
- Fasting Insulin test is performed when you have low blood glucose levels with symptoms such as sweating, palpitations, dizziness, fainting when you have diabetes and your health practitioner wants to monitor your insulin production sometimes when it is suspected that you have insulin resistance.
- A blood sample drawn from a vein in your arm for a Fasting Insulin test.
- You may be asked to fast for 8 hours before the blood sample is collected, but occasionally a health practitioner may do the test with, for example, a glucose tolerance test. In some cases, a doctor may request that you fast longer.
- Elevated insulin levels are seen with health conditions such as Acromegaly, Cushing syndrome, obesity, Fructose or galactose intolerance, use of drugs such as corticosteroids, levodopa, oral contraceptives etc.
- Decreased insulin levels are seen with health conditions such as diabetes, hypopituitarism and chronic pancreatitis.
No special preparation is needed for fasting insulin test. You just have to inform your doctor if you are taking any medications or have any underlying medical conditions or allergies before undergoing fasting insulin. Your doctor depending on your condition will give specific instructions.