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A member asked:
While doing a blood test, my blood color was blackish in color, im a smoker is it a serious issue and ive never donated or emptied blood in my life?
A doctor has provided 1 answer
How dark?: Venous blood is much darker than the arterial or capillary blood that you're used to seeing. If it did not evoke comment from the person who drew your blood, perhaps this is what you are seeing. If you have methemoglobinemia or sulfhemoglobinemia, the color is really strange and the lab person will comment. Low oxygen tension in venous blood is likely in a smoker only late -- this isn't yet.
Answered 9/15/2014
3.7k views
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