Detection of Hepatitis‐B Surface Antigen in Plasma Samples by Reversed Passive Haemagglutination Tests

摘要

Abstract.A comparison of two commercial reversed passive haemagglutination tests with a counter‐immunoelectrophoretic test, used to detect hepatitis‐B surface antigen in reconstituted freeze‐dried plasma, showed an increase in the number of positive results by the haemagglutination tests. No difficulty was encountered with the appearance of non‐specific agglutination provided the plasma was heated at 60 °C for 30 min, frozen overnight at ‐35 °C, thawed and centrifuged bef