The rarest blood type is Rhnull. Unlike other blood types, people with Rhnull blood have no Rh antigens on their red blood cells. Healthcare professionals classify blood type according to the ...

Specifically, this type of blood lacks any of the 61 Rh antigens. Its distinctive factor is indeterminable, thereby earning ...

it is found on the surface of red blood cells and you are considered to have Rh-positive (Rh+) blood type. If you have no Rh antigen then you are considered to have Rh-negative (Rh-) blood type.

The other blood types must be carefully matched to avoid adverse reactions. Each type can also be either Rh-positive (+) or Rh-negative (-), depending on whether they carry the Rh factor protein.