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I asked a question the other week regarding having antibodies in my blood...

I asked a question the other week regarding having antibodies in my blood from a previous pregnancy. I can`t see an answer in the answer section.
I asked "In what percentage of these pregnancies does the mother`s blood cross the placenta?" I understand that this condition is not a problem unless the blood crosses, but I can`t find out how often this happens - please help.
Also, when does it tend to happen - from what I have read, it seems more likely to occur late in the pregnancy which is why these babies are often delivered early -is this correct? Please answer this questions for me - I will not be seeing the specialist for several weeks to ask.
Thank you

Answer: Hi,
I did answer this query last week but I ma not responsible for posting on the site so I am not sure what happened. Antibodies develop in the mother’s blood when the baby’s blood and the mother’s blood mix during an insult during the pregnancy. This can be a bleed during the pregnancy that is sometimes not even detected. The problems occur not during that pregnancy but the next. The antibodies that have developed in the mother’s blood can be in large numbers and can attack that baby’s blood. This can cause jaundice problems with the baby and rarely more serious problems. The mother’s antibody levels are checked regularly during pregnancy; and if the levels are increasing further testing is done to see if it is causing problems with the baby. There are many treatments available for the baby and if it is severe a fetal blood transfusion can be done sot that the baby can recover from any damage to its blood. Usually the levels are quite low and the baby is only at a slight increased risk of jaundice after birth.
Best wishes,
Answered: 29 Jun 2009