2 step approach-ACOG
1st step is screening = GCT (Glucose Challenge Test)
→ Time= 24-28 weeks
→ No fasting required
→ Method: Give 50gm of glucose to patients
→ Check blood glucose levels
<140mg/dl-Nothing >140 but <180mg/dl-Perform- NEXT STEP
≥180mg/dl-Confirm Diabetes
→ ACOG recommends universal screening in all pregnant females irrespective of risk factors
→ In low risk pregnant females= GCT @ 24-28 weeks
→ In high risk females first is done @ antenatal visit, second @ 24-28 weeks.
2nd step = 3hr 100gm OGTT (Oral Glucose Tolerance Test)
→ Preparation= overnight Fasting (8-10hr)
1st sample= FBS (Fasting Blood Sugar)
Give her 100gm glucose
2nd sample = 1hr PP
3rd sample = 2hr PP
4th sample = 3hr PP