If you have had glucose screening previous pregnancies, or if you talk to other women about the glucose screening they have done, or if you just do a search on the Internet, you will discover that not all health care providers use the same protocols. Many practices, especially obstetricians, choose to use the American Academy of Obstetrics and Geoncolgy’s (ACOG) protocols which use different sugar loads and a different timing. ACOG recommends that women first do a 1 hour OGTT using only 50g of glucose. A fasting blood sugar is compared to a one hour blood sugar after 50g of glucose. If the woman fails this test she is then rescheduled for a follow up test. The follow up test involves a three hour test using 100g of sugar with the blood tested four times: One fasting and one each hour for three hours after the 100g of glucose is ingested.
At CCBC we prefer to use the American Diabetes Association’s (ADA) protocols which require only one test. That test is done with 75g of glucose as described above. We have chosen this test because it has been shown to be highly accurate at diagnosing gestational diabetes when it is done properly, including preparing for the test with a high carb diet three days prior. But we have also chosen this test because it does not require women with blood sugar issues to possibly undergo additional fasting and heavier sugar loads just to diagnose their problem. We don’t want to put women through an additional test if we do not have to. The 75g load is not that difficult on most women especially if they prepare for the test and follow it up with a high protein meal after they complete the test.