Pregnancy: What Are the Risks Associated with a Rhesus Negative?

The Rhesus factor may in some cases well individuals create complications in pregnant women. The greatest risks are often blood incompatibility between the mother and her child, for example when the mother is rhesus negative and the fetus has a RH positive.


Four blood groups, but only two rhesus factors
Human blood can be classified according to four different groups, namely A, B, AB and O. Furthermore, Rhesus factor consists of antigens that carry oxygen in the blood and which are placed on the surface of red blood cells. The presence of the Antigen D gives rise to a positive RH, which is 85% of the individuals. On the contrary, the absence of this antigen D reveals a Rhesus negative. The problem occurs when a pregnant woman carries a Rhesus negative and her fetus is RH positive. In this case, the mother’s immune system may react in the face of this antigen D and try to eliminate it by destroying red blood cells of the infant.

A significant risk
This incompatibility between the mother’s negative Rhesus factor and positive the baby Rhesus factor can cause anemia in the fetus, or even a miscarriage. In the first delivery, a small amount of red blood cells will spread into the bloodstream of the mother, when the placenta breaks. If the woman becomes pregnant again and the fetus is still positive RH, antibody anti RH will pass into the placenta and explode the red blood cells of the fetus.
Today, a Rhesus negative mother can give birth normally through the injection of antibodies anti-Church intravenously. This treatment is designed to destroy all red blood cells of the baby that is would be infiltrated in his blood. A regular blood test and an injection every time that a risk of contact arises between the blood of the mother and the child to avoid possible complications. Similarly, no RH antibodies will be more present in the mother’s body during her next pregnancy.



Massive obstetrical hemorrhage

Massive obstetrical hemorrhage