The glucose challenge test, also called the one-hour glucose tolerance test, measures your body’s response to sugar (glucose). The glucose challenge test is done during pregnancy to screen for gestational diabetes — diabetes that develops during pregnancy.

SPECIMEN: 2 mL (1 mL min.) plasma from 1 Grey Top (Sodium Fluoride) tube drawn 1 hour after oral administration of 55 g glucose monohydrate (equivalent to 50g anhydrous) oral glucose. Ship refrigerated or frozen. Does not include a fasting specimen.
STABILITY: Room: 6 hrs; Refrigerated: 72 hours; Frozen: 1 week
REPORT: Daily
USAGE: This is a screening test for Gestational Diabetes mellitus. In case of abnormal results, Obstetrical GTT is recommended.