The HOMA index test is a blood test that measures the level of insulin and glucose in the blood. It is used to assess insulin resistance, which is a condition where the bodys cells do not respond to insulin properly. The test is done by drawing a blood sample after an overnight fast, and the results can indicate if a patient is at risk for developing type 2 diabetes. The HOMA index test is a simple and non-invasive way to assess insulin resistance and can be used as a screening tool for patients with risk factors for diabetes.