Blood Transfusion and DNA testing

ya i understood your question. but the main thing we have to remember is that whether the blood will effect the dna or not by the process of transfusion.i think dna will not effect it.because dna will not come out side of the cell.because the nuclear membrane of the cells are made like that.the nuclear membrane will not allow the double helical strutures.so we know that the dna is a double helical structured molecule of based pairs pf nucleotides.so dna will not come out side of the even nucleus.and we have to remember the another important thing is thatthe red blood cells that are present in our blood have no nucleus that means it has no genetic material in its.and the other cells of blood like white blood cells and platelets have the nucleus so they have the genetic information in the form of rna and dna.so by these things i am also confusing some sort.so i have no perfect idea about it but i am able to think about the concept.so i will try my level best to do this problem.thank you