What you need to know on Rhesus Positive and Negative Blood Types

Knowing your blood type is important, especially if you have frequent blood transfusions or want to be pregnant. The ABO blood system labels blood types with the letters A, B, AB, and O. Your blood also has a Rhesus or Rh factor, which can be either negative or positive. You inherit your blood type and Rh factor from your parents.

 The Rh factor is located on your red blood cells, the Rh factor is a protein you did or did not receive from your parents. You are Rh positive when you have the protein. If the protein is not present, you are Rh negative. People with positive Rh factors have positive blood types, whether A+,B+, AB+, or O+. People with negative Rh factors then have negative

blood types, e.g. A-, B-, AB-, or O-.The majority of people have Rh positive factors.

 If you have a positive Rh factor, you can receive either Rh+ or Rh-blood during transfusions. If you have Rh- blood, you must receive Rh-. blood (except in certain life-threatening emergencies when you might need to receive Rh+ blood).

If you are female and Rh-, you will need to have your partner tests his Rh factor. If you are Rh- and he is Rh+, you can experience Rh incompatibility. This means that if your baby inherits his father's Rh+, your antibodies can attack the baby's red blood cells. This can cause extreme anemia and possible death for the baby.

 During your pregnancy, if you are Rh-, you will take blood tests to see whether your body is producing antibodies against Rh+ blood. The first will happen in your first trimester and the second will occur when you are 28 weeks pregnant. If no antibodies have developed, you will receive a shot of Rh immune globulin. This shot will prevent your body from producing harmful antibodies against your child.

If your body has produced antibodies against Rh+ blood, you will not receive an immune globulin shot. Instead, doctors will keep a close eye on your baby as he/she develops. Either before or after his/herbirth, your child might receive a blood transfusion.

Once your baby is born, doctors can test his/her Rh factor. If your baby shares your Rh factor, you will need no further treatment. If you are Rh- negative, however, and your baby is Rh+, you must receive another immune globulin shot.

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