Does a blood transfusion change your DNA?: "Dear Yahoo!:
Does a blood transfusion change your DNA?
Lori
Evart, Michigan
Dear Lori:
The short answer is 'no,' and the longer answer is 'no way.' We assembled our own little blog of blood to explain, drawing from a San Diego Union Tribune column, a posting on the MadSci Network, and several other sources.
It seems blood is composed of four main elements: red blood cells, white blood cells, platelets, and plasma. And, indeed, white blood cells do contain DNA. However, most blood transfusions involve only red blood cells, which do not contain DNA. And even in a rare whole blood transfusion, no traces of foreign DNA from the white blood cells have been detected in a recipient's blood.
On the other hand, there is at least one situation in which a transplant can change your DNA. After a bone marrow transplant, the DNA in a blood sample may actually reflect the donor rather than the recipient. That's because in this case, blood stem cells are transferred. The recipient will produce blood that contains the donor's cellular elements but almost none of his or her own DNA. And yes, this would affect DNA blood evidence (though there are other ways to test for DNA.)
Then there's the even rarer case of blood being transferred due to the anti-social behavior of vampires. But that's a whole other ball of serum"
