Diabetes Screening (1-hour Glucose Challenge Test – GCT)

October 6, 2011 by  
Filed under Diabetes Screening GCT Test



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The glucose challenge test is generally performed during weeks 26-28 of pregnancy, sometimes earlier if you are considered at risk for diabetes. This test is for gestational diabetes.

When this screening is done, you will be asked to drink a glass of a sweet glucose solution containing 50 grams of glucose. One hour later you will have a blood sample drawn so that your blood glucose level can be checked. A normal test result is below 135 or 140.

If your test result is abnormal, you will be asked to return for a second test called an oral glucose tolerance test. For this test you will need to fast overnight.

Just because you are asked to complete this second test does not mean that you have gestational diabetes. Of those women with an abnormal glucose challenge test, only about 15 percent will be diagnosed with gestational diabetes following the oral glucose tolerance test.




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