I know you shouldn't do it of course, but how much difference does it make to results if one has coffee with no sugar before a blood test?

2 Answers

  • Andy C
    Lv 7
    4 weeks ago
    Favorite Answer

    The caffeine won't obscure blood test results.   It will just artificially raise your blood pressure. 

  • Anonymous
    4 weeks ago

    Black coffee is fine; same with tea.

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