Source:http://linkedlifedata.com/resource/umls/id/C0001802
MSH: Tests that are dependent on the clumping of cells, microorganisms, or particles when mixed with specific antiserum. (From Stedman, 26th ed),CSP: mixing of antibodies with their corresponding antigens on the surface of large, easily sedimented particles such as animal cells, erythrocytes, or bacteria; the antibodies cross-link the particles, forming visible clumps.