Article 'HBsAg Testing in Commercial Plasmapheresis' by Clyde McAuley, M.D. and Kay Noel, Ph.D. Includes tables and figures showing; infectivity of commercial versus volunteer blood, techniques for measuring HBsAg, results of eight years of HBsAg testing experience in commercial plasmapheresis and HBsAg testing of Alpha Therapeutic Corporation's plasmapheresis donations.