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Rh incompatibility occurs when a mother with a negative blood type carries a child with a positive blood type, which can be dangerous for the baby. Immunization during the first pregnancy can prevent future complications, and testing the baby’s blood type can determine the potential presence of the condition. Prenatal care is crucial to detect and address the issue, and blood tests before marriage are recommended.
Rh incompatibility occurs when a pregnant mother with a negative blood type is carrying a child with a positive blood type. This can pose a serious health risk to the unborn baby, as the mother’s body can react to the baby’s blood type by producing antibodies against it. Rh incompatibility occurs only when the mother is blood type negative and the child positive. A woman with a positive blood type who has a baby with a negative blood type is not at risk for this condition.
In most cases, having a first child in case of incompatibility does not involve any risk for the newborn. It is usually the second child with the incompatibility who is at greatest risk. Normally, a woman is treated in her first pregnancy where Rh incompatibility exists, by immunizing her against the development of positive blood group antibodies. A woman usually receives an injection of gamma globulin at the 28th week of her pregnancy and another within three days after giving birth. This tends to prevent Rh incompatibility in future pregnancies.
A woman does not need to carry a baby to term to develop incompatibilities in future pregnancies. If a woman is pregnant and miscarries, she is usually given the same “vaccine” so as not to put the health of future children at risk. Sometimes, a woman may not know the history of previous children and whether she may have carried a child that produced Rh incompatibility. If you have a negative blood type and you had a previous pregnancy with a father whose blood type is not known, the best way to determine the potential presence of the condition is to test the baby’s blood type. If the baby has a positive blood type, it can be assumed that the woman will develop Rh incompatibility with other children if her partner has a positive blood type.
When the incompatibility is not addressed, which can be a problem for women not receiving prenatal care, the effects on the newborn can be very serious. A baby with incompatible blood can be born with brain damage, jaundice and, in severe cases, heart failure. Also, some babies die at birth or shortly thereafter when Rh incompatibility is not detected.
When women receive prenatal care, they are almost always tested for blood type to determine if there is a risk of Rh incompatibility. It used to be standard practice in the United States to request a blood test before marriage to be prepared for children who may be at risk for this condition. Few states still require this requirement, but if you’re planning to get pregnant, married or not, you should absolutely make sure you get both your own and your partner’s blood work done. Again, if the mother has positive blood, the father does not need to be tested.
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