Hyperinsulinemia can be diagnosed by checking blood glucose, plasma insulin, and insulin release test. 1. Checking blood sugar: Hyperinsulinemia can cause hypoglycemia. Blood tests to measure blood glucose concentration can help doctors diagnose the disease. 2. Plasma insulin test: The concentration of insulin in normal fasting blood is 5-20mU/L. If it exceeds this range, there may be abnormal insulin secretion. 3. Insulin release test: 75g of glucose is taken orally, and insulin secretion is detected at 30 minutes, 1 hour, 2 hours and 3 hours respectively. Under normal circumstances, the peak occurs in 30 minutes to 1 hour, and its peak value is 5-6 times of fasting insulin. If the peak insulin secretion is too high, the patient may have hyperinsulinemia. Patients with hyperinsulinemia should go to the hospital in time for examination and treatment under the guidance of the doctor.