Comparative studies of serologic tests for rheumatoid disease. II. A comparison of the bentonite flocculation test and the sensitized sheep cell agglutination test

Agreement was obtained between the bentonite flocculation test (BFT) and the sensitized sheep cell agglutination test (SCAT) in 96 per cent of a random population sample and in 88 per cent of a clinical sample. Rarely, positive results were obtained in either test alone. The BFT was more often positive than the SCAT both in rheumatoid arthritis and in other syndromes.