The Insulin Postprandial (PP) test measures your body's direct response to a meal. It's a "stress test" for your pancreas, drawn 2 hours after you eat. In a healthy person, insulin should rise to clear the sugar and then fall. In insulin resistance, your insulin level stays inappropriately high. This test is crucial for understanding how your body is actually handling the food you eat. A simple blood draw provides this real-world insight, giving your doctor a clear picture of your metabolic health in action.