Definition The glucose tolerance test is a laboratory method to check how the body breaks down (metabolizes) sugar. Alternative Names Oral glucose tolerance test How the test is performed The most common glucose tolerance test is the oral glucose tolerance test (OGTT). You cannot eat or drink anything after midnight before the test. For the test, you will be asked to drink a liquid containing a certain amount of glucose. Your blood will be taken before you do this, and again every 30 to 60 minutes after you drink the solution. The test takes up to 3 hours. The intravenous glucose tolerance test (IGTT) is rarely used. In this test, glucose is injected into your vein for 3 minutes. Blood insulin levels are measured before the injection, and again at 1 and 3 minutes after the injection, although the timing may vary. How to prepare for the test Make sure you eat normally for several days before the test. Do not eat or drink anything for 8-10 hours before the test. You cannot eat during the test. As...
Diagnosis Healthy adults age 45 and older should get tested for diabetes every 3 years. Patients who have certain risk factors should ask their doctors about testing at an earlier age and more frequently. These risk factors include: A weight that is 20% more than ideal body weight Sedentary lifestyle High blood pressure (greater than 140/90) or unhealthy cholesterol levels -- especially for patients with low HDL ("good") cholesterol and high triglyceride levels History of heart disease, stroke, or peripheral artery disease A close relative (parent, sibling) with diabetes A high-risk ethnic group background (African-American, Latino, Native American, Asian American, Pacific Islander) Having delivered a baby weighing over 9 pounds or having a history of gestational diabetes (in women) Polycystic ovary disease (in women) Children age 10 and older should be tested for type 2 diabetes (even if they have no symptoms) every 3 years if they are overweight and have at least two risk factors. Testing for ...
A blood glucose test measures the amount of a sugar, called glucose, in a sample of your blood.
Glucose is a major source of energy for most cells of the body, including those in the brain. The carbohydrates you eat eventually end up as glucose in the blood.
Glucose test - CSF
Glucose test - urine
Glucose tolerance test
Home blood glucose monitoring
Random blood sugar; Blood sugar level; Fasting blood sugar
How the test is performed
Blood is typically drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medicine (antiseptic). The health care provider wraps an elastic band around the upper arm to apply pressure to the area and make the vein swell with blood.
Next, the health care provider gently inserts a needle into the vein. The blood collects into an airtight vial or tu...
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