sYNoPsis The suitability of using dodecylamine-gel for removing the serum non-antibody-like inhibitors of haemagglutination by rubella virus was studied. Compared with kaolin and MnCl2/ heparin treatment this new procedure appears to have a higher specificity since it removes the non-antibody-like inhibitors from serum without affecting the immunoglobulin level significantly. The potential application of this procedure in routine serological analysis for rubella virus infection is discussed.