Postprandial insulin test measures the insulin levels in the blood after two to three hours of

food consumption. The test is used to check for diabetes.The normal insulin postprandial levels

range between 5.00 uU/mL - 55.00 uU/mL. The levels are increased in case of obesity and type II

diabetes.If insulin levels were too low, it may mean you have: Hyperglycemia (high blood

sugar) Type 1 diabetes. Pancreatitis, an inflammation of the pancreas.