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blood type query?

16 March 2010 2 Responses

A Parent asks, when i was an infant i had a blood test saying i was an O+.
when i was in primary school i had another blood test that said i was a O+.
now i am 28 and pregnant, they did another blood test which came back as A+.

because of the difference in my medical notes, they did the test a further two times, it kept coming back as A+.

is it possible for my blood type to change? I’ve never had any operations or transfusions.
is it possible that the two tests done earlier were incorrect?
were tests less accurate in the 80s?

2 Responses »

  • ~3 reasons for living~ said:


    I think the tests you had earlier in life were not accurate and/or the lab tech did not do a good job at confirming the results… which with any tests you do to determine the type of blood it should be mandatory!!!

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  • Rose said:


    I think that is scarey! I guess the previous ones were incorrect – I wonder whether you could access those notes where they were done. Your blood type cannot change.
    I had my blood type checked in the eighties and it was O+, however, it still is.

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