There are many tests for evaluating endogenous
insulin secretory capacity. However, there are only a limited number of studies that have examined in detail in clinical practice which method most accurately reflects the ability to secrete endogenous
insulin especially in hyperglycemic state. The purpose of this study was to find the endogenous
insulin secretory capacity and a possible predictor of
insulin withdrawal in subjects with
type 2 diabetes requiring hospitalization due to
hyperglycemia. In the endogenous
insulin secretory test during hospitalization,
CPR,
CPR index, and ΔCPR after
glucagon loading were all significantly higher in the
insulin withdrawal group. On the other hand, there were no difference in fasting
CPR index, HOMA-β, SUIT, and 24-hour urinary
CPR excretion between the two groups. In the
glucagon test of the
insulin withdrawal group, the cutoff value of ΔCPR was 1.0 ng/mL, the withdrawal rate of ΔCPR of 1.0 ng/mL or more was 69.2%, and the withdrawal rate of less than 1.0 ng/mL was 25.0%. In conclusion, it is likely that
glucagon test is the most powerful tool for predicting the possibility of
insulin withdrawal as well as for evaluating endogenous
insulin secretory capacity in subjects with
type 2 diabetes requiring hospitalization due to
hyperglycemia.