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...
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...
[Science of Diabetes] One of the most common questions asked by people with diabetes is: “What are normal blood sugar levels?” Unfortunately, there’s no simple answer to this question, because it depends on how you define normal. It’s like deciding when someone is rich or poor, tall or short, thin or fat, or young or old. Most people would agree that a very skinny person was thin and a very fat person was fat. But how about the sizes in between? When does underweight become normal and when does normal become overweight? It’s all a matter of definitions and cutoff points set by one group or another. The definitions of normal, prediabetes, and diabetes are usually made by august committees of diabetes experts, and they change from time to time. For example, not too long ago, it was decided that you’re diabetic if your fasting BG level is 126 mg/dL [to convert to mMol/L, divide by 18] or higher, instead of the previous cutoff of 140. There are some guidelines about ...
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