Bovine serum albumin (BSA 22% and 30%) are media, which are used as a potentiator in serological tests. The addition of these reagents increases the dielectric constant of the reaction medium, which in turn causes a reduction of the zeta potential of the red cells. This reduction in the negative charge reduces the minimum distance over which red cells can approach each other and allows IgG antibodies to agglutinate the red cells more easily. These reagents are standardised for use in serological tests according to the procedure described below. They have been prepared by fractionating bovine serum. The test procedure consists of three phases. This can provide valuable information on the serological characteristics of the antibody. These reagents meet the requirements of the concerned standards and guidelines. Performance characteristics are mentioned in the release documents, which are supplied with the products upon request. The principle of the test is the agglutination technique, which is based on antigen/antibody reaction. The inclusion of a positive control with each series of tests is strongly recommended.