After the glucose challenge test, the sample of blood is analyzed for its glucose (blood sugar) content and compared to a range of glucose levels that indicate whether the patient’s results are normal, or indicate gestational diabetes. The patient may visit the physician to obtain the test results or receive them by telephone.

A blood glucose level below 140 milligrams per deciliter (mg/dL) is considered normal. A patient with a normal test result will usually require no further testing. However, a woman being tested early, between the 12th and 14th weeks of pregnancy, will require another test around the 24th week.

A glucose level of 140 mg/dL or above is considered abnormal and may indicate gestational diabetes. However, not all women with abnormal test results have diabetes. To diagnose gestational diabetes, a physician will order a three-hour oral glucose tolerance test (OGTT).