<prompt> Which of the following tests are used to screen for gestational diabetes in a 22 year old primigravida?Oral glucose tolerance testFasting blood sugarGlycocyalted hemoglobin measurementRandom glucose challenge  <response>: Glucose challenge test GCT is commonly used in screening for gestational diabetes. No special preparation is needed for this test. Fifty grams of oral glucose is given between 24-28 weeks of gestation irrespective of the time or the meal and blood glucose is determined 1 hour later. A plasma value of 140 mgdl is considered significant to perform the confirmatory diagnostic test. Ref: Essential of Obstetrics By Arulkumaran, 2004, Page 149 ; Dutta, 6th ed, Page 285 