do you need to fast before a blood sugar test?
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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. You may want to schedule a fasting glucose test first thing in the morning so you don't have to fast during the day.
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You will be asked to drink a liquid that contains glucose (75 g). You will have blood drawn before you drink the liquid, and again 2 more times every 60 minutes after you drink it. Each time, your blood glucose level will be checked. Allow at least 2 hours for this test.
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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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What to know about fasting before your lab test. 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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Fasting before blood tests Fasting means that you eat and drink nothing except water for 8 –16 hours before your blood test (12 hours optimal).
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Your doctor will ask you to come for a blood test in the morning and they will explain that you should not eat anything before having this test, as the test needs to be done after you have fasted.
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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.
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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.
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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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Fasting blood sugar (FBS) measures blood glucose after you have not eaten for at least 8 hours. It is often the first test done to check for prediabetes and diabetes.
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How to prepare for this test. If you're asked to fast, you can't eat anything for 8-10 hours before the test. You should drink only water. If you are having an OGTT, you will need to drink a glucose drink provided after your fasting test, then stay for an additional few hours for further testing.
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If your doctor asks you to fast before a blood test, it's to ensure the results of the blood test are as accurate as possible. That's why a fasting blood test usually requires fasting for 8-12 hours before your blood is taken.
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Requirements Prior to the Test Fasting is required for a period of 8-10 hours prior to the test. (No food or fluids such as tea, coffee or fruit juice.) You may have sips of water if you are thirsty. Due to the nature of the test, testing is generally done in the morning.
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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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You may eat or drink a normal breakfast or lunch prior to the test, but please avoid anything that contains excessive sugar. For example, do not eat candy bars, drink soda or fruit juice, or eat any sugary cereal. Drink 10 ounces (entire bottle) of the glucose drink and note the time.
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You need to go to the lab one time for a 2-hour glucose tolerance test. For this test: 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.)
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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.