Why do people have to get a blood test before they get a marriage license? Can the results ever cause a marriage to be prevented?
by 
chopper chuck
ANSWERS: 4
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From http://www.nolo.com/article.cfm/objectID/EB95C264-54FF-4D07-A89342705EE7133F/118/304/192/FAQ/#757EB178-9077-4FFE-B43C01A4DFF91242 Are blood tests still required before marriage? A handful of states still require blood tests for couples planning to marry. Most do not. (See State Marriage License and Blood Test Requirements.) Premarital blood tests check both partners for venereal disease or rubella (measles). The tests may also disclose the presence of genetic disorders such as sickle-cell anemia or Tay-Sachs disease. You will not be tested for HIV, but in some states, the person who tests you will provide you with information about HIV and AIDS. In most states, blood tests can be waived for people over 50 and for other reasons, including pregnancy or sterility. If either partner tests positive for a venereal disease, what happens depends on the state where you are marrying. Some states may refuse to issue you a marriage license. Other states may allow you to marry as long as you both know that the disease is present.
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I don't believe it's mandatory in many places anymore. One benefit that I know of - if the partners don't know their blood types, is the Rhesus test. The second part of the blood group (+ or -) tells if the person is Rhesus positive or negative. This on its own is no issue, but when it comes to children, it can be a problem. If an Rh- woman has an Rh+ partner, and she becomes pregnant with an Rh+ baby, then her body will begin to create antibodies to this Rhesus factor. If she falls pregnant again, and this baby is Rh+, the antibodies from the last pregnancy can attack the baby, and cause damage. Since Andersen777's answer is so complete, I'll leave this as an addition.
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Another thing is if the blood types clash, it can create a baby that is + with a mother that is - blood type. This is dangerous because the mother's body will reject the baby as foreign. It's very important to know if you are two different blood types, especially + and -, because if the husband is positive, and the mother negative, the baby's will ultimately be positive because positive overrides negative. Or at least that's what I think is going on with that, but I could wrong.
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i never had to get one
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