[The development and testing of diagnostic criteria in psoriatic arthritis].

The paper is concerned with diagnostic criteria of psoriatic arthritis developed by the expert method. The criteria include 14 signs with the aid of which one can diagnose classical, definite and probable psoriatic arthritis. The sensitivity of the developed diagnostic criteria tried in 108 patients afflicted with psoriatic arthritis constitutes 99.2%, whereas the specificity tested in patients suffering from related diseases (reactive arthritides, ankylosing spondyloarthritis, seronegative rheumatoid arthritis) amounts up to 77.8%.