• Women of child-bearing age must be supplied with K-negative blood.
  • Patients with red cell alloantibodies:
    • Blood that is negative for the antigen against which the alloantibody is detected.
    • Give K negative blood insofar as possible as it can be difficult to exclude anti-K antibodies in the presence of other alloantibodies.
    • Patients with anti-D who have a rr phenotype should receive rr, K-negative blood.
    • Patients with Rh antibodies should be provided with Rh-matched blood to prevent further alloimmunisation.
    • Patients with alloantibodies against low-frequency antigens can be issued with IAT-compatible blood, rather than selecting antigen-negative units, which may be difficult to find.
    • Patients with clinically-insignificant alloantibodies can be supplied with 37°C IAT-compatible blood.
  • Children >1 year-old may use standard adult red cell components.