There are two types of test - DIPSI and OGTT Dipsi is a screening test and needs no fasting Where as OGTT needs

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There are two types of tests for checking for diabetes in pregnancy: 1. 75 g glucose in water and blood test after 2 hours without any fasting requirement (this is a screening test as per DIPSI guidelines suggested by many doctors and this is also valid) 2. 75 g OGTT where the fasting blood sugar test is done in the morning (after 8-12 hours of fasting) and then after 1 hr and 2 hr of 75 g glucose water intake, blood sugar is tested again. Either of them is ok. Some doctors prefer to do the first one  (screening test) and if that is positive they will suggest to do the next test which is a confirmatory test.

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Yes 75gms glucose 2hour ppbs is a correct ... 75gms is done irrespective of fasting status

This is not the standard fasting OGTT. For a 75 g OGTT, you should be fasting for 8–10 hours, take glucose, and blood is tested as advised. Follow your doctor’s instructions, but if the test prescribed is OGTT, clarify again—breakfast is usually not allowed before the test.

There are 2 types of tests. In india mostly- 75 gm glucose irrespective of fasting status - post 1 hr and post 2 hr blood sugars test. international guidelines- Fasting of about 8 to12 hr - fasting sample for blood sugars Then 75 gm glucose Post 1 hr and post 2 hr. It is ur doctor s preference. I think they suggested u the 1st one