Get Compatibility Rh Factor Blood Type Chart Background. The rarest blood type is rhnull. It is the second most important blood group system, after the abo blood group system.
The parents' rh factors may be incompatible. Someone who is rh positive or rh+ has at least one rh+ allele, but could have two. We give rh negative platelets to women of childbearing age (if the patient is rh negative), but other than you can receive any type regardless of your own blood type.
Facts about blood and blood types.
The rh factor genetic information is also inherited from our parents, but it is inherited independently of the abo blood type alleles. Overview of the rh factor and why pregnant women should be tested for it before giving birth. If the parents are heterozygous (having one rh factor allele. Abo and rh blood type distribution by country (population averages).