What does "Venous blood" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.
Venous blood is the blood that flows back to your heart after your body has used up the oxygen and nutrients. This blood is usually darker than the fresh, oxygen-rich blood that your heart pumps out. It's called "venous" because it travels through your veins, which are the blood vessels that carry blood towards your heart. This blood also carries waste products, like carbon dioxide, which your body needs to get rid of.
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