Affinity Biologicals Affinity Biologicals, Inc. is a primary manufacturer of products used worldwide in thrombosis and haemostasis research and medical diagnostics. Products include an extensive line of antibodies, conjugates, antibody pairs for immunoassay of human and animal analytes, the VisuLize™ line of complete ELISA kits, and a full line of human plasma products including affinity-depleted factor-deficient plasmas (Factors II through XIII, PC, PS, ATIII), calibrators and controls. Services include protein purification, antibody production, assay development, custom manufacturing and custom lyophilization.