INS and Hypoglycemia: Investigations revealed hypoglycemia with fasting blood glucose ranging between 33 mg% to 46 mg%, and high levels of postprandial glucose ranging between 299 mg% and 476 mg% in repeated measurement, insulin level was high (345 uIU/ml, N: 2–25 uIU/ml) and C-peptide levels (22 ng/mL).