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Sacks DB. Diabetes mellitus. In: Rifai N, ed. Editorial team. Glucose tolerance test - non-pregnant. How the Test is Performed.

The most common glucose tolerance test is the oral glucose tolerance test OGTT. Before the test begins, a sample of blood will be taken. The test may take up to 3 hours. How to Prepare for the Test.

Make sure you eat normally for several days before the test. Ask your health care provider if any of the medicines you take can affect the test results. How the Test will Feel. Drinking the glucose solution is similar to drinking very sweet soda. Why the Test is Performed. What Abnormal Results Mean. According to Diabetes UK :.

Depending on how high your blood glucose levels are, your midwife or doctor will recommend further testing or a treatment plan for you. You will also be given equipment to test your blood at home so you can keep an eye on your glucose levels. If you have particularly unstable blood sugar, or if an ultrasound scan has shown that your baby is very large, you may be prescribed medication, or insulin injections.

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. Doctors usually recommend a glucose tolerance test between weeks 24—28 of pregnancy. Those with a higher risk may need a test earlier in the pregnancy.

Risk factors for gestational diabetes include :. A study published in notes that gestational diabetes affects 14 percent of pregnancies every year. Together you'll come up with a treatment plan, which will cover:. Your high blood sugar should last only as long as your pregnancy. But some women who develop diabetes during pregnancy still have it after delivery, so you'll have another glucose test six to eight weeks after your baby is born.

Folic acid may reduce gestational diabetes risk. How will gestational diabetes affect my baby? Tips from moms-to-be with gestational diabetes. Will gestational diabetes affect my birth options? BabyCenter's editorial team is committed to providing the most helpful and trustworthy pregnancy and parenting information in the world.

When creating and updating content, we rely on credible sources: respected health organizations, professional groups of doctors and other experts, and published studies in peer-reviewed journals. We believe you should always know the source of the information you're seeing.

Learn more about our editorial and medical review policies. Gestational diabetes. Practice bulletin no. Gestational diabetes mellitus. Glucose screening tests during pregnancy. Join now to personalize. Photo credit: iStock. Why do I need a glucose screening test during pregnancy?

When is the glucose screening test taken during pregnancy? How is the glucose screening test done? Do I have to fast? I have the results of my glucose screening test. What's the normal range for blood sugar? What is the glucose tolerance test? What is the glucose tolerance test like? I have the results of my glucose tolerance test. What's the normal range, and what's considered a high blood sugar level? What is the two-hour glucose tolerance test, or one-step test? Will the glucose tests make me feel sick?

Does glucose testing carry any risks? Is there anything I can do to help me pass the glucose tests?



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