do you have to fast for a hba1c blood test?
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If you have diabetes, your HbA1c level may be done every 2-6 months by your doctor or nurse. This test measures your recent average blood sugar (glucose) level. Because it is an average measurement you do NOT need to fast on the day of the 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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For the three-hour test: 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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Because it doesn't require fasting, the test can be given at any time as part of an overall blood screening. The A1C test is also known as the hemoglobin A1c test or HbA1c test.
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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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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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Not all blood tests will require you to fast beforehand. Blood tests that you will likely need to fast for include: blood glucose test. liver function test.
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How do you prepare for a blood test? Some blood tests will require you to fast beforehand. In these cases, your doctor will instruct you not to eat or drink anything, except water, in the hours leading up to the test.
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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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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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The most common types of tests that require fasting include: 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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The fasting glucose tolerance test is the simplest and fastest way to measure blood glucose and diagnose diabetes. Fasting means that you have had nothing to eat or drink (except water) for 8 to 12 hours before the test.
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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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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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When your doctor orders a CBC, there are no special preparations you'll need to take before the test. You are not required to fast (not eat solid foods for 12 hours or so), unless you are having other tests done at the same time that require it.
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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.