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A member asked:
Blood tests this morning and i noticed that the blood in the tubes looked quite dark compared to usual. is that of any significance?
2 doctors weighed in across 2 answers
No, venous blood: Venous blood is darker than arterial or mixed arterial and venous blood. If the tourniquet was left on more than a minute, that can make the blood look even darker.
Answered 12/24/2015
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Not likely: Venous blood is usually very dark. Arterial blood is bright red.
Answered 12/24/2015
1.8k views
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