What if I fail the one hour oral glucose challenge for gestational diabetes?
A result of 140mg or higher on the 1 hour challenge screening is considered to be a “positive screen.” The mother will then be tested in a 3 hour glucose tolerance diagnostic test.(OGTT) The three hour OGTT requires an overnight fast. For 3 days prior to the overnight fast, the mother should eat a normal diet (including at least 150g of carbohydrates). It is best to avoid caffeine and smoking since they can raise the level of glucose in the bloodstream. Check with your provider about other medications you may need to stop as well. Your blood will be drawn first and this is your “fasting” blood sugar level. You will then drink several ounces of glucose solution and have your blood tested again at 1, 2 and 3 hours. How will I know if I fail the 3 hour OGTT? The numbers for the 3 hour OGTT test for gestational diabetes are as follows: Normal – 100mg at 3 hours Positive (if two of more of the tests results are at the following levels or higher) • Fasting – 105mg • 1 hour – 190mg • 2 hours
