Fasting Insulin

Insulin blood test also referred to as fasting insulin test, is a test used to measure the amount of insulin in the body. It is also used to monitor the treatment of abnormal insulin levels and also to monitor insulin resistance. The majority of people with polycystic ovary syndrome (PCOS) have insulin resistance or high insulin. Testing for insulin resistance can be helpful to rule out other conditions that are commonly misdiagnosed as PCOS. Polycystic ovary syndrome (PCOS) is a full-body endocrine and metabolic disorder that is closely tied to insulin resistance.

What is insulin resistance?

Under normal conditions, the hormone insulin rises briefly after eating. It stimulates the liver and muscles to take up sugar from the blood and convert it to energy. That then causes blood sugar to fall, and then insulin to fall. With normal insulin sensitivity, both sugar and insulin are normal on a fasting blood test. With insulin resistance, blood sugar may be normal, but insulin is high.


Because the pancreas has to make more and more insulin to try to get its message through. Too much insulin generates inflammation and causes weight gain. It can also lead to Type 2 diabetes and heart disease. Too much insulin is also an underlying physiological driver of PCOS

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