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    Same Blood Group Parents need advice, PLEASE HELP
    An_222132 posted:
    I really want to ask that can both A+ parents give birth to an O- child??? If so how does this work. Also would there be any complications for the child if the parents share the blood group, if so then how can that be avoided before pregnancy.

    thank you soooooo much
    jrap1978 responded:
    • Two AB parents could have any of an A, B or AB, but not O.
    • Two A parents could have either A or O children, but not B or AB.
    • Two B parents could have either B or O children, but not A or AB.
    • Two O parents could only have O children; they cannot have have A, B or AB.
    • If both parents have rhesus-negative blood, so will their children. If both have positive, the child might be either.
    FCL responded:
    Yes, two A parents can have A , A-, O and O- children. There are no complications and no risks associated with this.
    Roy Benaroch, MD responded:
    jrap is correct.

    You can think of type "O" as being type "nothing"-- it actually isn't a letter O, but a symbol that was intended to mean that the blood had neither the A antigen, nor the B antigen.

    For baby for have either A or B, it had to have come from at least one parent. But parents don't have to give their blood letter antigens to their children, so a parent who is B can contribute B or O (nothing); a parent who is A can contribute A or O; parent who is AB can contribute A or B or O; parent who is O can only give O.

    The Rhesus factor (also called "D") works the same way. If you've got it, you can contribute it to a child, but you don't have to. If you don't have it, child can't get it from you (but could from the other parent.) Two parents both of type Rh negative cannot have a child who is Rh positive, but any other combination of parents can have a child who is Rh pos or negative.

    You know, I'm not sure this is really any clearer now! Sorry about that. Anyway: bottom line is that blood type doesn't matter in any significant way except perhaps in the immediate newborn period (increased risk of jaundice, but that's easy to treat and isn't anything to worry about) or if someone needs a STAT emergency blood transfusion (even then, from a practical point of view it doesn't matter, you'll get the O- low antigen emergency unit waiting pre-warmed in the ER no matter what blood type you think you are.)

    Rh negative women need a dose of anti-D antibody "Rhogam" during pregnancy to avoid problems with future pregnancies. if you're really curious, I'll tell you why, but this response already is too long and confusing!

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