Comparative studies of serologic tests for rheumatoid disease. I. A comparison of a latex test and two erythrocyte agglutination tests in a random population sample

Abstract

Abstract Sera from a random sample of the population of Rotterdam were tested by a latex fixation test (LFT) in Leiden, a sensitized sheep cell agglutination test (SCAT) in Manchester and a human erythrocyte test (HEAT) in Groningen with an overall agreement of 93.3 per cent. In both rheumatoid and nonrheumatoid subjects sera were encountered which were positive in the cell tests but negative in the LFT and vice versa.