INS and Hypoglycemia: The Endocrine Society Guidelines recommend investigation in patients in whom Whipple's triad is fulfilled.2 When performing laboratory investigation of hypoglycemia, it is imperative to draw a plasma glucose level not just a finger-stick capillary blood glucose level to confirm hypoglycemia with simltaneous measurement of levels of insulin, proinsulin, C-peptide, β-hydroxybutyrate and an oral hypoglycemic agent screening.