about blood transfusion and dna traces ?

Question

A person has a blood transfusion.

will they eventually cycle out the transfused blood so that they have only thier dna ,
or will traces of the transfused blood dna still remain in the body years after transfusion ?
and would both dna codes come out in a test?

Answer 1

Normal red blood cells have a life of about 120 days, and do not have a nucleus, so DNA is extremely minimal. White blood cells, which do have a nucleus, last about 10 days. Transfused blood has had most of the white cells taken out, and does not last as long as your own blood when transfused. So the amount of time it would take for the donor DNA to be cleared from the body would be days, not years. I believe that a swab from the inside of the mouth would circumvent any problems involving blood transfusion and DNA, anyway.

Answer 2

If this is a genuine question, I will give a genuine answer. The human body will indeed recycle the blood donation and bearing in mind that the amount of blood in the average adult's blood stream (approx 9 pints) is moved around all the organs so quickly, your own DNA profile would become obvious within as little as 2 minutes.