It is best to go by how long your Dr. wants you to. Various of lengths of fasting for various results.
Depends on your doctor but the general rule is 10-12 hrs.
That is a question for your doctor. I would not trust the public on something like this. If you need to fast, how long you need to fast & if you need to fast from just food or food & water depends a lot on the type of lab test(s) that are being done & also depends on your medical condition & doctor.
Thank you Debbie and Valerie.
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