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February 17, 2025
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How long do I have to fast for before a blood test?
- If a fasting blood test is ordered, you should not have anything to eat or drink (except water) for at least eight hours. This usually involves an overnight fast.
- You should continue to take any prescription medications unless your physician directed you not to take them.
- Smoking and exercise may affect your results as well, so you should refrain from these activities as much as possible during this time.
- If you have any concerns about refraining from food for this period of time, talk to your physician.
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