how long do you fast before your glucose test?
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Common fasting blood tests a fasting blood glucose test (used to test for diabetes) – you fast for 8 to 10 hours before the test.
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You will be asked to come to the test fasting — not having had anything to eat or drink for the previous eight hours. A fasting blood sugar will be obtained.
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How to prepare for a blood glucose test. Blood glucose tests are either random or fasting tests. For a fasting blood glucose test, you can't eat or drink anything but water for eight hours before your test.
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With certain blood tests, you may be instructed to fast for up to eight hours before your appointment. Fasting before a blood draw means you don't eat or drink anything except water.
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Sometime between weeks 24 and 28, your doctor will test to see if your body is using sugar correctly. You'll drink a very sugary liquid and then, an hour later, you'll have a blood test. You do not need to fast before this 1-hour glucose test, but don't have a doughnut on your way to the doctor's office either.
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DO NOT eat or drink anything (other than sips of water) for 8 to 14 hours before your test. (You also cannot eat during the test.) You will be asked to drink a liquid that contains glucose, 100 grams (g) . You will have blood drawn before you drink the liquid, and again 3 more times every 60 minutes after you drink it.
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Fasting blood glucose: A test to determine how much glucose (sugar) is in a blood sample after an overnight fast. The fasting blood glucose test is commonly used to detect diabetes mellitus. A blood sample is taken in a lab, physician's office, or hospital. The test is done in the morning, before the person has eaten.
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With certain blood tests, you may be instructed to fast for up to eight hours before your appointment. Fasting before a blood draw means you don't eat or drink anything except water. Don't wait until the day of your blood draw to ask if you should fast. That could cause your appointment to be rescheduled.
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If fasting is required, you should not have anything to eat or drink (with the exception of water) for 10–12 hours before your test. Unless advised by your doctor, you should take all regular medication.
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Typically, you need to chew four glucose tablets to get enough glucose. Once you take glucose tablets, recheck your blood sugar in 15 minutes. A simple rule—15 and 15—makes this easy to remember. You need 15 grams of glucose then wait 15 minutes.
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A blood glucose test measures the amount of a type of sugar, called glucose, in your blood. Results are often ready in 1 to 2 hours. Glucose levels in a blood sample taken from your vein (called a blood plasma value) may differ a little than glucose levels checked with a finger stick.
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Glucose Tolerance Test You'll fast (not eat) overnight before the test and have your blood drawn to determine your fasting blood sugar level. Then you'll drink the liquid and have your blood sugar level checked 1 hour, 2 hours, and possibly 3 hours afterward.
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You usually need to fast for 8–12 hours before a test.
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The American Diabetes Association (ADA) recommend the following action: Take 15 grams (g) of carbohydrate and wait 15 minutes before testing blood sugar levels.
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Tell your doctor about any prescription or over-the-counter medications or supplements you're taking. You may need to fast (refrain from eating or drinking) for four hours before the test.
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For these blood glucose tests used to diagnose diabetes, you must fast at least 8 hours before you have your blood drawn.
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This test requires a 12-hour fast. You should wait to eat and/or take a hypoglycemic agent (insulin or oral medication) until after test has been drawn, unless told otherwise. Eating and digesting foods called carbohydrates forms glucose (blood sugar).