INS and Hypoglycemia: The initial workup for hypoglycemia revealed an elevated insulin level of 182.8 uU/mL (ref range: 2.0 - 22.1 uU/mL), an elevated C-peptide level of 17.9 ng/mL (ref range: 0.5 - 3.3 ng/mL), and an undetectable insulin antibody level of less than 0.4 U/mL (ref range: 0.0 - 0.4 U/mL).