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A 33-year-old male asked:

For blood work, i'm often told to fast a certain number of hours. does the fast begin right after you eat, 20 min after or maybe even 30 min after? sometimes it takes awhile for nutrients to get into the bloodstream. maybe i'm being meticulous?

2 doctor answers • 2 doctors weighed in
Dr. Clarence Grim
Dr. Clarence Grimanswered
Endocrinology 59 years experience
Usually it means no food after midnight till blood drawn and drink water if thirsty.
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Answered Mar 16, 2022
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Dr. Gurmukh Singh
Dr. Gurmukh Singhanswered
Pathology 51 years experience
Fasting starts when you finish eating. Fasting for 8 hours is needed for blood glucose and a minimum of 9 hours for blood lipids. You can drink water and take your medications, unless told by doctor to do otherwise.
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Answered Mar 16, 2022
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Last updated Mar 16, 2022

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