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A member asked:

Could you tell me what is the percentage of oxygen returned to the heart after it leaves the lungs?

A doctor has provided 1 answer

Question is unclear: Oxygen saturation of arterial blood after it's left the lungs is 95-98%. Less than 90% is abnormal. Venous blood has an oxygen saturation in the range of 80% as it returns to the right side of the heart.

Answered 5/19/2014

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