INS and Hypoglycemia: Biochemical investigations revealed a hypoglycemia of 41 mg/dL, respectively 46 mg/dL, a plasma insulin level of 15.28 uIU/mL, respectively 15.48 uIU/mL (normal value: 3–25 uIU/mL), and C-peptide of 2.2 ng/mL (normal value: 0.9–7.1 ng/mL), respectively 2.01 ng/mL, in two consecutive days (Table 1).