Rhpositiivisella

Rhpositiivisella refers to an individual who has the Rh D antigen present on their red blood cells. This blood group factor is inherited and is part of the larger Rh blood group system. The presence of the Rh D antigen means that a person is considered Rh positive. In most populations, a majority of people are Rh positive.

The Rh factor is determined by a gene that produces the Rh D antigen. Individuals inherit two copies of this gene, one from each parent. If at least one of these copies results in the production of the Rh D antigen, the individual will be Rh positive. If both copies of the gene do not result in the production of the Rh D antigen, the individual will be Rh negative.

The most significant implication of Rh status arises during pregnancy. If an Rh positive fetus is carried by an Rh negative mother, a condition known as Rh incompatibility can occur. This happens if fetal blood cells, which are Rh positive, enter the mother's bloodstream. The mother's immune system may then produce antibodies against the Rh D antigen, which are called anti-D antibodies. In subsequent pregnancies with an Rh positive fetus, these antibodies can cross the placenta and attack the fetal red blood cells, leading to hemolytic disease of the newborn (HDN). Modern medical practices, such as the administration of Rh immune globulin (RhoGAM), effectively prevent this from happening in most cases.