However, an abnormal or positive test result means you are at risk for having gestational diabetes and we will need you to do the three-hour glucose test. So how does the three-hour test work? There are multiple blood draws for the three-hour glucose test, the first after fasting for hours. Then you will be given a similar glucose liquid to drink and blood samples will be taken at 1, 2, and 3 hours after completing that drink.
Because activity can interfere with the results, you will need to stay in the lab during the duration of the test, so we recommend bringing something to read, a project to work on, something to watch while you are waiting. You may drink plain water during the test however no food can be consumed at the time. Bring a snack for after cause you may be quite hungry. Based on the results of this test and other criteria that your doctor uses, you will be given a diagnosis.
We hope this video gave you an overview of the testing performed to check for gestational diabetes. This results in high blood sugar levels. Early diagnosis can be the key to effective treatment and reducing the risk of long-term complications. The most common type is the oral glucose tolerance test OGTT. Find out about the glucose tolerance test, any risks of the procedure, and other ways to confirm diabetes.
A glucose tolerance test measures glucose levels in the body. Because a person does the test over 2 hours, it can show the doctor how the body processes glucose. In a healthy person, the blood glucose level will rise after eating sugary food and return to normal after the body absorbs the glucose. In a person with diabetes, blood sugar levels may remain high. Before taking the test, a person should fast for 8—12 hours. They cannot eat or drink, but they can usually sip some water during this time.
The final result will indicate whether a person has or is at risk of developing diabetes:. If the test result suggests prediabetes or diabetes, a doctor will discuss treatment options for addressing this.
The person may take a two-part test :. Glucose screening test : The person has a blood test without fasting, then drinks a glucose drink and has another blood test one hour later. Glucose tolerance test : The person will have a fasting blood test, then drink a glucose drink and have further blood tests 1, 2, and maybe 3 hours later.
If blood sugar levels are high, and the person has not had a diagnosis of diabetes before, the doctor will probably diagnose gestational diabetes. Gestational diabetes starts when the body is unable to make all of the insulin it needs for pregnancy. Low insulin levels, combined with hormonal changes, can lead to insulin resistance. When this happens, high levels of glucose build up in the blood.
If your glucose level is lower than the abnormal results described below, you do not have gestational diabetes. If only one of your blood glucose results in the oral glucose tolerance test is higher than normal, your provider may simply suggest you change some of the foods you eat. Then, your provider may test you again after you have changed your diet. If more than one of your blood glucose results is higher than normal, you have gestational diabetes. You may have some of the symptoms listed above under the heading titled "How the Test will Feel.
There is little risk involved with having your blood taken. Veins and arteries vary in size from one person to another and from one side of the body to the other. Taking a blood sample from some people may be more difficult than from others. Oral glucose tolerance test - pregnancy; OGTT - pregnancy; Glucose challenge test - pregnancy; Gestational diabetes - glucose screening.
American Diabetes Association. Diabetes Care. PMID: pubmed. Committee on Practice Bulletins--Obstetrics. Practice Bulletin No. Obstet Gynecol. Diabetes mellitus complicating pregnancy. Gabbe's Obstetrics: Normal and Problem Pregnancies. A fasting blood specimen is taken specimen 1. You will then be given a 75g dose of glucose to drink, all of which is to be consumed within 5 minutes. Once you finish the drink you will be asked to stay in the waiting room.
After 1 hour, another blood specimen is collected specimen 2. A third blood specimen is collected 1 hour later specimen 3. After the test you are free to return to your usual activities and consume food and drink. Need more information?
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