Table 1

ASAS classification criteria for peripheral SpA. Adapted from Rudwaleit et al4

Peripheral arthritis and/or enthesitis and/or dactylitis*
PLUS
≥1 SpA feature
Uveitis
Psoriasis
Crohn’s/colitis
Preceding infection
HLA-B27
Sacroiliitis on imaging		OR≥2 other SpA features
Arthritis
Enthesitis
Dactylitis
Inflammatory back pain (in the past)
Family history of SpA

  • *Current peripheral arthritis (compatible with SpA), enthesitis and/or dactylitis, diagnosed clinically by a doctor.