Do a husband and wife have to have a blood test before they get married and if their blood is incompatible what health effect will it have on their child?

Having a blood test before you are married is usually a good idea, even if it isn't required. However, that is to make sure neither of the partners have any STDs or other diseases If a mother has negative blood of any type and the father has a positive they will need to test the baby's blood type (before it is born). If it is positive the mother will need to receive a shot in order to reduce the risk of miscarriage.

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