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

1.8k views

Thank
Dr. David Lipkin answered

Specializes in Internal Medicine

Not likely: Venous blood is usually very dark. Arterial blood is bright red.

Answered 12/24/2015

1.8k views

Thank

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