INS and hyperinsulinemic hypoglycemia: Most importantly, testing for insulin autoantibodies in non-diabetic adults with hyperinsulinemic hypoglycemia is recommended by the Endocrine Society as the first-line test in such patients.[15] A limitation of this case is that insulin antibodies and HLA genotyping, especially for the HLA-DRB1∗0406 genotype, were not checked, as testing was not available at our center.