This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Gynae), Subject name: Gynaecology & Obstetrics
Search for gestational diabetes is carried out at what gestational age? 
Select and explain. 
A. 16 weeks, B. 20 weeks, C. 28 weeks, D. 32 weeks
C: 28 weeks
Answer: C: 28 weeks 
Explanation: Ans, c (28 weeks). (Ref. Textbook of Obstetrics by Dutta, 3rd ed., 292)Note: The actual answer is 24 to 28 weeks.GTT IN PREGNANCY# Screening for gestational diabetes should be done between 24-28 weeks of gestation by using glucose tolerance.# Test - 50 gm oral glucose without regard to time of day and last meal.# Plasma glucose of 140 mg% or 130 mg% of whole blood at 1 hour is considered cut-off point for consideration of 100 gm (WHO 75 gm GTT). TimeWhole blood (mg%)Plasma1Fasting19010521 hr16519032 hr14516543 hr125145