Each person has two Rh factors in their genetics, one from each parent. Only people with at least one Rh-negative factors will have a negative blood type, which is why the occurrence of Rh-negative blood is less common than Rh-positive blood.

How did I get Rh negative blood?

Each person has two Rh factors in their genetics, one from each parent. The only way for someone to have a negative blood type is for both parents to have at least one negative factor. For example, if someones Rh factors are both positive, it is not possible for his or her child to have a negative blood type.

Is O Negative the same as Rh negative?

O negative blood is missing both the A antigen and the B antigen and does not contain the protein for Rh positive blood. This means that its missing those things that could cause a bad reaction during a blood transfusion and can be given to any blood type.