<prompt> Glod standard test for insulinoma72 hr fasting testPlasma insulin levelsC-peptide levelsLow glucose levels 30 mgdl  <response>: A fasting test that may last for up to 72 hrs is regarded as the most sensitive test.Usually , insulin, pro insulin, C-peptide and blood glucose are measured in 1- to 2-hr intervals to demonstrate inappropriately high secretion of insulin on relation to blood glucose. About 80 of insulinomas are diagnosed by this test,most of them in first 24 hrs . Bailey Love ,26th,788 