Fasting For Blood Work Explained
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Fasting for blood work is typically recommended for 8–12 hours before a blood test. In some cases, it is necessary to fast for up to 16 hours. During this time, it is important to avoid eating or drinking anything other than water. Some tests, such as those for lipid levels and glucose tolerance, require longer fasts of up to 24 hours.
Fasting For Blood Test Questions and Answers
What Blood Tests Require Fasting?
Various blood tests require fasting, including lipid panel, glucose, iron, B12, folate, and thyroid–stimulating hormone (TSH) tests. Fasting for 8–12 hours before a blood test is recommended, as it allows for accurate results and can help prevent incorrect diagnoses.
Why Fast Before Blood Tests?
It is recommended to fast before blood tests because fasting allows for more accurate results. When you fast, your body is in a resting state and your glucose, cholesterol, and triglyceride levels will be more consistent. Fasting also allows for more precise measurements of hormone and enzyme levels in the blood.
How long do I have to fast before the test?
It is recommended that you fast for 8-12 hours prior to having a blood test. Be sure to check with your doctor to determine the best fasting time for the specific test you are taking.
What can break a fast for blood test?
Things that can break a fast for a blood test include eating or drinking, smoking, and taking medications or supplements. Also, Do NOT chew gum, chewing gum can also break a fast and give inaccurate results.
When can I eat normally after a fasting blood test?
Most people can eat normally after a fasting blood test. However, it is important to follow the instructions of your healthcare provider. If you are advised to fast for longer than 8 hours, you should wait until after that time period before eating.
Closing:
Fasting for blood work will provide accurate test results. Depending on the phlebotomy procedure and what types of labs you are having drawn fasting may be required. It is always important to remember to speak to your health care provider for any questions you may have related to your specific test. As soon as your test is over, you are able to eat and drink as normal.
