Unusual Rh Phenotypes
•When all of the D antigens (D, C, E, c, e) are missing
•Rhnull :
•Rhmod :
•Also lack Rh antigens but due to inheritance of XQr gene
•If anti-Rh29 (total Rh) is detected then Rhnull blood is required for transfusions
•What type of blood is transfused for these patients:
•Also are missing S, s, U, and LW antigens
•Due to inheritance of amorph regulator gene Xor or amorph r gene