asas_peripheral_spa: ASAS Criteria for Peripheral Spondyloarthritis (SpA)

In cliot: Clinical Indices and Outcomes Tools

ASAS Criteria for Peripheral Spondyloarthritis (SpA)

Description

Applies the Assessment of SpondyloArthritis international Society (ASAS) classification criteria for peripheral spondyloarthritis. These criteria are applicable to patients with peripheral arthritis, enthesitis, or dactylitis. Classification is achieved if the patient has at least one specific SpA feature (Group 1) OR at least two other SpA features (Group 2).

Usage

asas_peripheral_spa(arthritis, enthesitis, dactylitis, uveitis, psoriasis,
                    crohns_colitis, preceding_infection, hla_b27,
                    sacroiliitis_imaging, inflammatory_bp, family_history_spa)

Arguments

arthritis	Numeric (0 or 1). Peripheral arthritis (Entry Criterion).
enthesitis	Numeric (0 or 1). Enthesitis (Entry Criterion).
dactylitis	Numeric (0 or 1). Dactylitis (Entry Criterion).
uveitis	Numeric (0 or 1). Uveitis (past or present). (Group 1 Feature).
psoriasis	Numeric (0 or 1). Psoriasis (past or present). (Group 1 Feature).
crohns_colitis	Numeric (0 or 1). Crohn's disease or ulcerative colitis (past or present). (Group 1 Feature).
preceding_infection	Numeric (0 or 1). Preceding infection (urethritis/cervicitis or diarrhea within 1 month before arthritis). (Group 1 Feature).
hla_b27	Numeric (0 or 1). Positive HLA-B27 status. (Group 1 Feature).
sacroiliitis_imaging	Numeric (0 or 1). Sacroiliitis on imaging (MRI or X-ray). (Group 1 Feature).
inflammatory_bp	Numeric (0 or 1). History of inflammatory back pain. (Group 2 Feature).
family_history_spa	Numeric (0 or 1). Family history for SpA (in first- or second-degree relative). (Group 2 Feature).

Value

A list containing:

Classification	"Classified as Peripheral Spondyloarthritis", "Not Classified", or "Not Applicable".
Criteria_Met	Indicates which criteria set was satisfied (Group 1 or Group 2).

References

Rudwaleit M, van der Heijde D, Landewé R, et al. The Assessment of SpondyloArthritis international Society classification criteria for peripheral spondyloarthritis and for spondyloarthritis in general. Ann Rheum Dis. 2011;70(1):25-31. doi:10.1136/ard.2010.133645

Examples

# Example 1: Group 1 Met
# Arthritis (Entry), Psoriasis (Group 1)
asas_peripheral_spa(1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0)

# Example 2: Group 2 Met
# Enthesitis (Entry + Group 2), Family History (Group 2)
# Total Group 2 count = 2
asas_peripheral_spa(0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1)

cliot documentation built on Dec. 1, 2025, 1:06 a.m.