: why does blood transfer not change someone’s DNA?
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Red blood “cells” are not fully alive and don’t have a nucleus or DNA. Other cells in your blood such as white blood cells have DNA, which is how they can get DNA from blood samples.
Your blood doesn’t last all that long. The average red blood cell lasts about 2 weeks. When you get a transfusion, those new blood cells will be gone from your body within two weeks. Blood doesn’t self replicate, it is manufactured in your bone marrow. So any transfusion you get will eventually be replaced by your own blood cells.
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