<prompt> Which of the following tests is not used in the diagnosis of insulinoma?Fasting blood glucoseXylose testC-peptide levelsInsulinGlucose Ratio  <response>: Ans. b Xylose testRef: Blumgart 5th edn- Page 936Tests for Insulinoma: 72 hours Fasting Blood sugar and Insulin level Gold Standard to diagnose Insulin: Glucose ratio 0.4 is consistent with insulinoma Elevated Insulin Level 5-10microunitsml Increased Serum Pro insulin Elevated C - Peptide levels Absent Urinary or Plasma Sulfonyl ureas to look for Drug induced hypoglycemic episodes IOC to localise preoperatively - Selective Venous Sampling after arterial Calcium infusion. IOC to localise Intraoperatively - Intra OP USG 