Red cells which carry the Rh D antigen are RhD positive.

RhD essential facts:

85% of the population are RhD positive and 15% RhD negative

RhD positive patients can receive any RhD type blood

RhD negative patients where possible should receive RhD negative blood

RhD-negative patients can make anti-D if they are exposed to RhD positive cells through transfusion or pregnancy.

Remember RhD Negative females of child bearing potential SHOULD NEVER be transfused with RhD Positive cells.