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How often does the blood cross the placenta and cause these complications?

Following blood tests, I have been informed that I have antibodies in my blood, probably from my previous pregnancy. I will be monitored by a specialist, but the soonest appointment I could get is in 4 weeks. In the meantime I have looked upthings on the internet including what happens if the blood crosses the placenta and the treatments provided if this happens. There was one vital bit of infomation I couldn`t find anywhere, so I am wondering;
"How often (in what % of these pregnancies) does the blood cross the placenta and cause these complications?"
I would just like to have some idea of how likely this is to help get my head around it. Would really appreciate your input
Many thanks
Melanie

Sarah...
Answer: Hi Melanie, You will be closely monitored and have further blood tests to check the level of antibodies in your blood. This is an indication of how affected the baby may be. There is no exact percentage as there are many levels that the baby can be affected. Some are only mildly affected and some more moderately. There are many treatments available now for the baby so the chances of having long term severe complications from this are very rare. Best wishes, Alex
Answered: 22 Jun 2009