What does rhd blood group positive mean?

RH blood group is a kind of human blood group system, which has five antigens, and D antigen is the strongest, so it is generally called RH positive blood with D antigen on the surface of red blood cells.

Rh blood group system, which contains C, C, D, E, E five antigens, all red blood cells containing D antigen (also known as Rh antigen) are Rh positive, otherwise they are negative.

In China, RH-negative blood group accounts for only three thousandths, belonging to rare blood group. The ratio of RH negative type A, type B, type O and type AB is 3: 3: 3: 1.

RH-negative people can't accept the blood of RH-positive people, because the antigen in RH-positive blood will stimulate RH-negative people to produce Rh antibodies. RH positive blood transfusion can lead to hemolytic transfusion reaction.

Extended data:

There are more than 30 blood types discovered by modern humans. I mainly analyze ABO blood group system, which accounts for the vast majority.

There are many kinds of human blood types, each of which is determined by genetic factors. The most common blood type is ABO blood type, followed by Rh blood type, followed by MN and MNSs blood type.

The genetic gene of type A blood can be the combination of bisexual A and A to form AA, or the combination of one sex A gene and another sex O to form AO. However, regardless of AA or AO, the displayed blood type is type A, and type O is an invisible genetic gene, so it cannot be displayed.

The genes of type B blood are similar to those of type A blood, some are BB and some are BO, but they are all B.

The genetic genes of blood types AB and O are consistent with their blood types, AB is AB and O is OO. Therefore, if the parents are blood type A or B, their children may be blood type A or B, but they may also be blood type O, because both of them contain the recessive gene O. When the O in the father's genetic gene combines with the O in the mother's genetic gene to form OO, they will be O. ..

References:

Baidu Encyclopedia-Blood Group Genetic Rules Table