Insulin values are not blood glucose values; blood glucose values are the amount of glucose in the blood, and insulin values are how much insulin is secreted by the pancreatic beta cells of the pancreas. The diagnosis of diabetes depends on the value of blood glucose, which is usually taken as venous blood glucose in the fasting state or 2 hours after a meal. Insulin value needs to do islet function test, islet function test needs to be in the fasting state, in at least 8 hours without energy intake premise, 75g anhydrous dextrose injection dissolved in 250-300mL of water, within 5-10 minutes to drink, respectively, before drinking and after drinking 30 minutes, 1 hour, 2 hours and 3 hours to take venous blood, through the islet function can be The insulin secretion at each time point can be seen by the islet function. In normal people, insulin secretion is adequate, with a peak at 0.5-1 hour, whereas in type 1 diabetes there is no insulin secretion at all or less. type 2 diabetes patients have adequate insulin secretion, but there is insulin resistance and the peak is delayed, usually around 2-3 hours. islet function is the main indicator of the pancreas’s insulin secretion.