Monoclonal anti-D antibodies submitted to the Third Monoclonal Interna
tional Workshop were evaluated against a number of D variant cells usi
ng standard serological techniques. The monoclonal antibodies were abl
e to discriminate between the cells of Categories Va, VI and DFR but n
ot Category III cells. Cells within each category did not give any abe
rrant results. The Rh:33 cells behaved as normal Rh(D) positive cells.