RT Journal Article SR Electronic T1 An automated passive haemagglutination technique suitable for the detection of hepatitis B virus antigen and antibody in blood donors JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 343 OP 350 DO 10.1136/jcp.26.5.343 VO 26 IS 5 A1 Margaret Nelson A1 Elizabeth J. Phipps A1 Pamela G. Watson A1 Jacqueline R. Watts A1 Roman Zwolenski YR 1973 UL http://jcp.bmj.com/content/26/5/343.abstract AB A method is described for preparing purified hepatitis B antigen (HB Ag) viral antigen without density gradient centrifugation. A method for sensitizing human group O red cells with this preparation is given, together with the technical details of an automated passive haemagglutination technique suitable for the mass screening of blood donors for HB virus and anti-HB antibody.