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Can Pregnancy Change Your Bloodtype?

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?

peanuts from Virginia

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September 16, 20070 found this helpful

This is the place that says it most clearly.

http://www.gynob.com/rh.htm

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September 17, 20070 found this helpful

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

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September 17, 20070 found this helpful

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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