do i have to fast for glucose blood test?
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For a fasting blood glucose test, you can't eat or drink anything but water for eight hours before your test. You may want to schedule a fasting glucose test first thing in the morning so you don't have to fast during the day. You may eat and drink before a random glucose test.
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If a fasting glucose (FBS), LDL, or Triglycerides test is ordered for you do not eat anything 8 to 12 hours before coming into the laboratory to have blood samples collected. You may drink water and take any prescription medications, but nothing else by mouth. No coffee or tea.
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['Random blood sugar test. A blood sample will be taken at a random time. ... ', 'Fasting blood sugar test. A blood sample will be taken after an overnight fast. ... ', 'Oral glucose tolerance test. For this test, you fast overnight, and the fasting blood sugar level is measured.']
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Your doctor has requested that you have a glucose tolerance test. These tests are generally scheduled for first thing in the morning. This test will take around 2 hours to complete. Three blood specimens will be taken unless your doctor has extended the test and asked for additional specimens to be taken.
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For this test you will need to fast for 8 hours before test. When you arrive at the lab or health care facility, you will: Have your blood tested. Drink a special liquid containing glucose.
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You should not eat for eight hours before having your blood glucose measured to check for diabetes or to see how well treatments are working. An alternative test for glucose level that does not require fasting measures a substance called hemoglobin A1c, which reflects average blood sugar over the previous three months.
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Blood glucose test You should fast for up to 8 hours before having your blood glucose measured to check for diabetes or to see how well treatments are working.
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For this test, you'll be asked to avoid eating or drinking anything other than sips of water for 8 to 14 hours before your test, the U.S. National Library of Medicine says. Once you arrive at the testing site, you'll have your blood drawn. Then, you'll be asked to drink a liquid that has 75 grams of glucose.
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Glucose tests, which measure blood sugar. One type of glucose test is called a glucose tolerance test. For this test you will need to fast for 8 hours before test.
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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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For these blood glucose tests used to diagnose diabetes, you must fast at least 8 hours before you have your blood drawn. If you have symptoms of diabetes, your doctor may use the random plasma glucose test, which doesn't require fasting.
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You will need your blood drawn every hour for 2 to 3 hours for a doctor to diagnose gestational diabetes. High blood glucose levels at any two or more blood test times—fasting, 1 hour, 2 hours, or 3 hours—mean you have gestational diabetes. Your health care team will explain what your OGTT results mean.
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Do I need to fast before I have my blood test? Food does not usually affect your blood tests for hormonal studies, so it's okay to eat.
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A blood test taken in the morning before you eat anything is a more accurate test. Do not eat or drink anything except water for 8-10 hours before a fasting blood glucose test. A level of 7.0 mmol/L or more indicates that you have diabetes.
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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. Each time, your blood glucose level will be checked. Allow at least 3 hours for this test.
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However, fasting is required before commonly ordered tests for glucose (blood sugar) and triglycerides (part of the cholesterol, or lipid, panel) for accurate results. You should not eat for eight hours before having your blood glucose measured to check for diabetes or to see how well treatments are working.
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Fasting blood sugar (FBS) If you do not have diabetes, do not eat or drink anything other than water for at least 8 hours before the blood sample is taken.