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But when a mother is Rh negative and her fetus is Rh positive, the mother’s blood may produce antibodies against the baby’s Rh factor. On its own the Rh factor does not cause health problems. Mild transfusion reactions are not dangerous, but a severe transfusion reaction may be deadly. But if an Rh negative (RhD-) person receives Rh positive (RhD+) blood, their body reacts, making chemicals (antibodies) to defend against the foreign Rh factor. If this is not available, they may be given blood from a compatible blood group. Otherwise a reaction to the ‘foreign’ blood may occur. When someone needs a blood transfusion it is preferable that they are transfused with blood from the same ABO and RhD groups as their own. For example, someone’s blood may be ‘O positive’ (written O+) and another person may be ‘AB negative’ (written AB-).
A negative blood type facts pregnancy plus#
Each blood type is also further identified by a plus (+) or minus (-) sign, which designates the Rh status of the blood. In Australia, around 80 per cent of people are Rh positive.īlood is classified into groups, the most well-known being the ABO system in which a person’s blood is recorded as either A, B, AB or O. Most people have the Rh factor and test Rh positive (RhD+), however, some people don’t have the Rh factor and so are Rh negative (RhD-). A person’s blood is either Rh positive (has the RhD protein) or Rh negative (doesn’t have the RhD protein). Rhesus factor was originally named (incorrectly) after rhesus monkeys, but now scientists more correctly refer to it as Rh factor.
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Rhesus factor is an inherited protein called RhD which is found on the surface of red blood cells. It happens when a rhesus negative woman carries a fetus with rhesus positive (RhD+) blood.įortunately, even though your baby’s blood type is not usually known until delivery, a simple treatment during pregnancy can help prevent problems in women who are RhD negative. Rhesus disease is an incompatibility between the blood types of the mother and the baby.
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If you have rhesus negative (RhD-) blood and are pregnant, your fetus may be at risk of health problems caused by rhesus disease.