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Can Pregnancy Change Your Bloodtype?


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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?

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peanuts from Virginia

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September 16, 20071 found this helpful

This is the place that says it most clearly.

www.gynob.com/rh.htm

 
By Diana (Guest Post)
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

 
By betty webb (Guest Post)
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+.

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A lab could explain it to your mother.

 
January 29, 20200 found this helpful

This is happening to me now... I'm a nurse and have always been very aware of my blood type. I've also donated blood in years past and O+'s are known as universal donors.

I have a son who is almost 2 and during my pregnancy with him my labs confirmed me as 0+ (as I have been my entire life). But now... I'm 7 months pregnant and 2 tests have come back stating that I'm now O-. Now my midwife is sending me to get retested a 3rd time but directly at Quest Labs this time.

I know that during pregnancy fetal and maternal blood can sometimes mix, so I've been wondering if it's the baby's blood they are detecting or if mine has indeed been somehow changed.

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I never had an auto immune disease or marrow transplant or received any sort of transfusions that would warrant my natural blood type to change. I haven't even had any shots or taken so much as over the counter medications of ANY KIND since being pregnant with my 1st. Just vitamins. Both of my parents are O+ and my husband is also O+. Two O+ parents have a 6% chance of having an O- baby (94% for O+).

 

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