My mom had her blood typed recently and was shown to be B+. Her medical records from 50 years ago say she was B-. My sister says pregnancy can change a woman's blood type. My sister says she also went from B- to B+. Is this possible?
This is the place that says it most clearly.
Have her doctor explain it to her
Perhaps she is RH(-) but Du (+) which is REALLY Rh(+)
you blood type cannot change BUT labs can make typing mistakes
your blood type does not change. Labs test more throughly now than they did years ago. I was classified as ab- but I had to receive blood a few months ago and I had to take ab+.
A lab could explain it to your mother.
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