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A member asked:
Can i drink black coffee before blood work that requires a 12 hour fast?
5 doctors weighed in across 2 answers
Fasting: Yes. Of course. Every primary care specialist will advise you to avoid calories when you are fasting. So water and black coffee are the two things that are allowed. Every office I have worked at tells their patients this when they are told to fast prior to coming in for these lab tests.
Answered 8/28/2019
4.6k views
No: Fasting requires no food and no beverages (water may be allowable). Coffee contains caffeine ; other chemicals that can enter your blood stream. Drinking black coffee can skew some laboratory tests. It is not a true 12 hour fast if you drink coffee.
Answered 10/19/2020
4.6k views
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