Blood Group A Negative but both parents O positive?

Tests and investigations
1

hi everyone,

I am 6 months pregnant and obviously have had a few blood tests as you do and found out i'm A negative blood group. Didn't think much of it but was discussing the anti D injection with my parents who told me they are both O Positive. after lots of reading up on this i realised this isnt possible... half of me is like "what the hell" but the other half is a bit like just leave it... bit confused to be honest. is it the case that its absolutely impossible for them to both be O and me be A.? :(

2

Dear KIRSTEN
When i became pregnant i had several repeat blood tests. My first one indicated I was AB negative. The next one suggested I was A positive. I have subsequentLy been tested as O positive, A negative and last year, A POSITIVE. So to this day i am really not sure of my blood group. Despite during my pregnancy being tested as a positive blood group I was still given the ANTI gamma D for mothers belonging to a negative blood group. Either lab results are inaccurate or maybe, just some of us may be of Transylvanian descendancy.
Hope all goes well for you.

3

It is impossible for your biological parents to both be O positive if you are A negative. The most likely explanation is that one of your parents is misinformed about what their blood group is.

4

thank you :slight_smile: i was starting to think i might be the milkman’s lol