do you have to fast for an a1c blood test?
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Health care professionals can use the A1C test alone or in combination with other diabetes tests to diagnose type 2 diabetes and prediabetes. You don't have to fast before having your blood drawn for an A1C test, which means that blood can be drawn for the test at any time of the day.
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Hemoglobin A1c, also called A1c or glycated hemoglobin, is hemoglobin with glucose attached. The A1c test evaluates the average amount of glucose in the blood over the last 2 to 3 months by measuring the percentage of glycated hemoglobin in the blood.
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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.
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Remember what your A1C measures: your average blood sugars over the past three months. The good news is that if your A1C is on the high side, say, 10% or higher, it will likely start to drop within two to three months (in other words, the higher it is, the faster it comes down).
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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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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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Diabetes is a condition that can lead to there being too much sugar in the blood. A fasting blood glucose test measures levels of sugar in the blood to see if they are healthy. It is important that a person has not had anything to eat or drink other than water for 8 to 10 hours before a fasting blood glucose test.
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Diabetes Canada suggests the following A1c and blood glucose ranges as a general guide. Blood glucose: Fasting and before meals: 4.0 to 7.0 millimoles per litre (mmol/L) 2 hours after meals: 5.0 to 10.0 mmol/L or 5.0 to 8.0 mmol/L if A1c targets are not being met.
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If your blood sample is being tested only for a complete blood count, you can eat and drink normally before the test. If your blood sample will be used for additional tests, you may need to fast for a certain amount of time before the test. Your doctor will give you specific instructions.
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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 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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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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In most cases, doctors ask people to measure fasting blood sugar immediately upon waking and before they have anything to eat or drink. It may also be appropriate to test blood sugar before eating or sometimes 2 hours after a meal when blood sugar has returned to normal levels.
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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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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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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. Fasting before certain blood tests is important to help make sure that your test results are accurate.