Risk factors may include:. If your doctor determines you're at risk or you have a suspicious value on the one-hour test, you may be advised to take a three-hour glucose tolerance test.
After drinking the glucose solution, you'll likely need to remain in the doctor's office or lab while you're waiting for your blood glucose level to be tested.
If the results of your glucose tolerance test indicate type 2 diabetes, your doctor may repeat the test on another day or use another blood test to confirm the diagnosis.
Various factors can affect the accuracy of the glucose tolerance test, including illness, activity level and certain medications. If you're being tested for gestational diabetes, your doctor will consider the results of each blood glucose test. If one of the results is higher than normal, you'll likely need to test again in four weeks.
If two or more of the results are higher than normal, you'll be diagnosed with gestational diabetes. If you're diagnosed with gestational diabetes, you can prevent complications by carefully managing your blood glucose level throughout the rest of your pregnancy. Explore Mayo Clinic studies of tests and procedures to help prevent, detect, treat or manage conditions. Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission.
This content does not have an English version. This content does not have an Arabic version. Sections for Glucose tolerance test About. Overview The glucose tolerance test, also known as the oral glucose tolerance test, measures your body's response to sugar glucose.
Request an Appointment at Mayo Clinic. Your doctor should give you advice about what to do to prepare for a glucose tolerance test. This may include information about how long to fast for before having the test. There are usually no side-effects from a glucose tolerance test apart from a small bruise which may appear at the place where the needle was inserted. Rarely, the vein used to take the blood may become swollen; this usually settles within a few days.
J Am Coll Cardiol. Epub Jun 9. Position Statement - Early identification of people with, and at high risk of Type 2 diabetes and interventions for those at high risk ; Diabetes UK, Nov Disclaimer: This article is for information only and should not be used for the diagnosis or treatment of medical conditions.
Egton Medical Information Systems Limited has used all reasonable care in compiling the information but make no warranty as to its accuracy. Consult a doctor or other health care professional for diagnosis and treatment of medical conditions.
For details see our conditions. In this series. In this series: Pre-diabetes Impaired Glucose Tolerance. In this series Pre-diabetes Impaired Glucose Tolerance. In this article What is a glucose tolerance test? How does a glucose tolerance test work? What happens during a glucose tolerance test? What should I do to prepare for a glucose tolerance test? Are there any side-effects or complications from a glucose tolerance test? If the results of your glucose screening show elevated levels of glucose in your blood, it's possible that you might not be producing enough insulin to process the extra glucose in your system.
Your doctor may then order a glucose tolerance test GTT. For this diagnostic test, you'll be asked to fast have nothing to eat or drink except water for eight hours beforehand. Your blood will be drawn, and then you'll drink a higher-concentration glucose mixture. Your blood will be drawn three more times, at one, two and three hours later. You'll also need to monitor your glucose levels yourself several times a day with a home blood sugar meter.
This special machine uses a drop of blood from your finger to give you an immediate reading. If you're not able to control the condition with changes to your diet alone, your doctor may also prescribe a medication to keep your GD in check. That said, you might not feel your best after chugging that glucose drink.
Because the drink floods your system with lots of sugar, some women find that they feel a little sick after drinking it — usually nauseous, sweaty or lightheaded. At every prenatal appointment, your practitioner will take a sample of your urine to check, in part, for glucose — a possible sign of gestational diabetes. If your urine glucose levels are high and you have certain risk factors for developing gestational diabetes, or if your practitioner finds large amounts of glucose at any single testing, you may need to take a glucose screening earlier than usual.
More than likely, you simply indulged a high-sugar craving like a Danish, cupcake, bagel or orange juice shortly before your urine was tested, which can cause a positive glucose finding in both pregnant and non-pregnant women. This becomes even more likely from the second trimester of pregnancy on, when your body resists the efforts of the hormone insulin to transport all the glucose you've ingested from your blood into your cells in order to deliver glucose to your developing baby.
Once you've both absorbed the glucose you need, your kidneys dispose of the excess through your urine. Here are some tips on what to eat to keep blood sugar spikes at bay, plus other smart strategies:.
Muffins, orange juice, sugary cereal and other sweet, refined carbohydrates are the primary culprits behind glucose spikes, because they enter your bloodstream quickly and can result in extra sugar being filtered out through your urine. In fact, since complex carbohydrates contain more fiber, they actually slow the absorption of sugar into your bloodstream. Aim to log 30 minutes of moderate-intensity exercise, like walking or swimming , at least five days a week, ACOG recommends. When you can, try to squeeze in an extra or minute walk after meals.
Moving after eating is especially good for blood sugar control. Gaining too much or too quickly during pregnancy can increase the chances for GD, so talk to your doctor about what you should be seeing on the scale. What to Expect follows strict reporting guidelines and uses only credible sources, such as peer-reviewed studies, academic research institutions and highly respected health organizations.
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