Abstract: An evaluating method of a testing element having an immobilized antigen or antibody on an immobilizing carrier thereof, which immobilized antigen or antibody has yet to react with another antigen or antibody, which involves contacting the testing element with a solution containing an antibody or antigen reactive with the immobilized antigen or antibody, specifically binding a labelling compound to the reactive antibody or antigen to thereby cause a color-developing reaction of the labelling compound, and determining an amount of the antigen or antibody immobilized on the testing element as a function of a level of produced color. Using this evaluation method, a quantitative determination of the immobilized antigen or antibody can be carried out, and thus the performance of the testing element for antigens or antibodies can be evaluated.

Abstract: In vivo-soluble composite particles involving a particle of a polymeric substance such as polylactic acid and the like soluble in a living body, having coated on a surface thereof, a calcium phosphate compound having a Ca/P ratio of about 1.0 to 2.0. The in vivo-soluble composite particles have a highly increased adsorptivity with regard to medicaments, antigens and others and also the in vivo-soluble composite particles can be dissolved or decomposed in the living body without producing a remainder in the body.

Abstract: A detection sheet capable of detecting an antigen or antibody in a biological fluid with a high sensitivity in a simple operation, as well as a detection kit and detection method using the detection sheet. The detection sheet comprises (a) a fibrous aggregate with carried particles of a calcium phosphate compound having an average particle diameter of about 0.01 to 200 microns and a Ca/P ratio of about 1.0 to 2.0, and (b) an avidin, streptavidin or avidin derivative from which carbohydrates have been extracted immobilized on said calcium phosphate compound. After a biotinylated antigen or antibody is bonded to the immobilized avidin, streptavidin, or avidin derivative of the detection sheet, the detection sheet is contacted with a test solution to thereby bond an antigen or antibody of the test solution to the detection sheet.

Abstract: A test plate for an agglutination test which comprises a plate with a plurality of wells formed thereon, each of the wells having adhered to a surface thereof a protein A and/or a protein G. The agglutination test plate, according to the present invention, when used in an agglutination test, can ensure a clear judgment concerning the formation of an agglutinative image or a non-agglutinative image, along with a good determination sensitivity. A process for the production of such an agglutination test plate is also provided.