Fasting insulin usually requires 8 hours of fasting, early morning fasting blood test, 117.8pmol / L in the normal value range, generally does not matter. The reference range of fasting insulin for normal people is 17.8 to 173.0 pmol/L, therefore, 117.8 pmol/L is normal. To check fasting insulin patients need to fast for at least 8 hours and have their blood drawn on an empty stomach early the following morning. Insulin is produced by the body’s insulin β-cells and can be used for typing of diabetes, evaluation of pancreatic function and insulin resistance in diabetic patients.There is an absolute decrease in insulin secretion in patients with type 1 diabetes, and in patients with type 2 diabetes, the level of insulin in the early and middle stages of diabetes is normal or slightly high, and the level decreases in the late stages of the disease. Patients who need to check fasting insulin are advised to do so under the guidance of a physician.