I'm RH- and so is DH so I don't need the shot. I've had to remind the dr countless times of that fact but they still insist on bringing up the silly shot. (Sometimes they'll even say some rubbish about "what if the baby's father is not your dh and your too scared to say something"


bunch o' jerks - how rude.) I vaguely remember reading about the shot though and here's what little I remeber (i.e. take my info for what it's worth, but you'll still want to look it up yourself

(sorry)
First thing I remember is that you take this shot because if you are pg with a RH+ baby
and some of the baby's blood gets into your system your body will develop antibodies to the RH+ baby blood. This does not usually pose a problem to the first baby because the baby's blood does not usually enter mom's system until birth, if at all. But if you become pg again after being sensitized, your blood could cross the placenta and attack the second baby's blood.
This can cause anemia, and jaundice, and a few other things. There are treatments for this like intra-uterin transfusions, but it's better to try and prevent it.
The problem that I read was that the shot itself is antibodies to rh+ blood. So in essence, you are being injected with the same antibodies you are trying to prevent your body from creating. The benefit is that your body does not produce antibodies, the risk is that you've been injected with the antibodies anyway and they can attack the baby's blood just as well as yours can. Theory is that the injected antibodies wouldn't attack as much of the baby's blood as your body would if it were sensitized to rh+ blood. Also, they usually give you the injection at 28 weeks so the baby is further developed and could withstand the attack of the injection better than a subsequent baby if you are sensitized because your blood would attack his or hers from conception. They also give you an injection within 72 hours after birth just to be sure.
My humble opinion is that it would be best to wait until within a few weeks of birth to have the first shot, but the problem is that some babies are early birds and it's tough to figure out when "a few weeks before delivery" will be.
The thing that I don't understand is: I thought the placenta keeps maternal blood away from the baby just as it keeps baby's blood from the mom. So if this is the norm, and blood only usually mixes at birth, logically thinking you wouldn't need the shot because who cares if blood mixes at birth? Blood should not be mixing throughout pg. anyway unless there is some serious trauma, or you have an amnio or something.

: Is that not true? So I'm not sure what the actual risk of sensitization is. The placenta is supposed to be preventing a blood mix sensitized or not. kwim? So what is the percentage of sensitized women who actually have probs with subsequent babies, and how many of those problems were due to some other trauma?
So that's what I have, sorry it's not complete. Oh, yeah, I did look up the package insert and it said that no studies have been done on the effects of using of rogahm in pg women

:

so did they study it's effect on pg men? :LOL