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Your doctor says you need to fast before some blood tests. WebMD explains what that means and why you have to do it. ... For instance, if you eat or drink before a fasting blood glucose 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. Fasting before ...


While the level of most blood components will not change rapidly from consuming nutrients, some of the substances in your blood will be affected by eating or drinking in the hours prior to the test. Before having blood tests completed, be sure to check with your doctor so you know if you can eat or need to fast prior to the test.


For example, if your doctor is testing your blood electrolytes or blood cell counts, then you certainly can eat before the test. If your doctor is planning on looking at your blood sugar levels, then you will not be able to have any food during the day before your blood test.


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. Don’t wait until the day of your blood draw to ask if you should fast.


Eating and drinking before a blood test depends on the type of test you're having. The healthcare professional who arranges your blood test will tell you whether there are any specific instructions you need to follow. You can eat and drink as normal before some blood tests.


Fasting before a blood test is when people are asked not to eat or drink anything other than water before some blood tests. But which blood tests require fasting and how can people fast safely ...


Fasting before a blood test is important to obtain accurate readings. When you consume food, your body has to process the food's components as they travel through your bloodstream. Blood tests examine a variety of blood and sugar levels that can be compromised if foreign entities, such as food, ...


Most people eat throughout the day and are never in a fasting state. The only exception is the 8-12 hour period prior to a blood test. Results obtained when blood is drawn during this fasting period may not reflect what’s in your blood under normal conditions. This can lead to a false sense of security.


What was the point of fasting before having a cholesterol test? Not eating for eight to 12 hours before having blood drawn for a cholesterol test was thought to give a more accurate assessment of ...