I was looking for the post to quote saying that Rh- mothers reject the Rh+ fetus as if it was another species. That isn't true. Look at the mule or hiney - it is a distinct species that is born to either a donkey or a horse and it is not rejected by the mother. It just can't reproduce.
Quoting: Anonymous Coward 12100946 Unfortunately, you are conducting a huge fallacy by assuming that such equines have similarities to humans, which is false (I'd love to see you try to outrun a galloping horse on foot). That is why we have human drug trials as animal testing is a faux pas and cannot accurately mimic the metabolism of the human body.
Additionally, you're making a fallacy in comparison. Horses and mules are two different species. Rh negatives and rh positives are of the same species, but with different bloodtypes. There's a big difference between a difference in species and a difference in bloodtype.
Proof of the miscarriages is in the RHogam's shots existence. The term is 'Rh disease', although this is a misnomer as it makes one think it's some sort of infection, when it's an immunity issue. The biological process (Rh negative blood's infamiliarity with the antigen-D (Antibody-generating - where antigen comes from) results in the whites cells of the Rh negative blood attacking the Rh positive blood).
The same process applies to blood transfusions. An A bloodtype will reject a B blood-type as it carries the B antigen marker, which the A blood-type is not familiar with, and thus sees as hostile.
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link to www.med.nyu.edu]
Also, I can't blood from anyone but O types. My body will react to the antigens and reject it and I might well die. I am, for all intents and purposes, allergic to all other blood types because I lack the antibodies against the antigens they carry, much like Rh incompatibility. The only difference is that there's no rejection in pregnancy.
Quoting: Anonymous Coward 12100946 If you can't receive blood from anyone but O types, then you're an O-type blood carrier. Although you haven't mentioned whether you're Rh positive, given the lack of distinction (you can receive any(?) O type?) I'd assume you're Rh positive.
You're taking your anti-Rh negative zeal thing a bit too far that you're throwing out established facts (the miscarriages are established, well documented and proven - look it up online).
As for the 'not always a miscarriage', that's because it requires that part of the baby's blood be Rh positive (Rh negatives won't miscarry on Rh negative child), and that it passes the blood barrier of the placenta - and the immune system has to actually identify the red cells are Antigen-D and make (generate) antibodies for it - once the antibody markers are created, then miscarriage is likely. If the rh positive blood does not pass the blood barrier of the placenta, the child should be fine, but it is a risk.
