Many people are familiar with the ABO blood typing system ... told Live Science in an email. This Rh variant — a type of RhD, ...

Like the ABO group and Rh factor, these rare blood types are genetic. They may also be associated with various health conditions and symptoms; for example, the McLeod phenotype is associated with ...

Currently, blood is primarily categorized according to its ABO group and the presence or absence of the Rh factor. The blood type a child has is determined by genetics. Doctors mix a patient's ...