A member asked:

What causes blood to be dark, almost black when drawn for lab tests?

A doctor has provided 1 answer
Dr. Dominic Riganotti answered

Specializes in Infectious Disease

Deoxygenation: Blood is never black..it just looks deep red from venous circulation. When blood becomes oxygenated...it gets bright bright red...when deoxygenated....dark red/maroon.

Answered 3/8/2019

3.1k views

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