ArticleThe Journal of rheumatology2025
HLA-B27 Testing in Clinical Practice: A Retrospective Analysis of Testing Indications and Rheumatology Referral Patterns.
Article in The Journal of rheumatology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectiveThe HLA-B27 allele is strongly associated with spondyloarthritis (SpA). HLA-B27 is included in SpA classification criteria and referral strategies for axial SpA. Investigations of HLA-B27 testing in usual clinical practice are limited.
methodsWe identified all adult patients tested for HLA-B27 from January 1, 2022, to December 31, 2022, in the Mass General Brigham healthcare system. We examined patient demographics; ordering provider specialty; testing indication; concurrent testing with antinuclear antibodies (ANA), rheumatoid factor, and/or anticyclic citrullinated peptide autoantibodies; and rheumatology referral. We compared the rate of rheumatology referral between HLA-B27-positive and HLA-B27-negative patients.
resultsHLA-B27 tests were ordered for 1960 patients (62.4% female; average age: 47.4 yrs). The most common specialties testing HLA-B27 were rheumatology (39.7%) and ophthalmology (21.4%). The most common indications for HLA-B27 testing were peripheral arthritis (33%), uveitis (22%), and back pain (16.7%). The majority of HLA-B27 tests (69.3%) were ordered concurrently with other autoantibody tests. A total of 11% of tested patients were HLA-B27 positive. Ophthalmology had the highest positive rate (15.4%), whereas reactive arthritis was the indication with the highest positive test rate (50%). A greater proportion of HLA-B27-positive patients were referred to rheumatology (53% vs 32%;
conclusionHLA-B27 testing was frequently performed by rheumatologists and nonrheumatologists for a broad spectrum of indications. Cotesting HLA-B27 with ANA and rheumatoid arthritis autoantibodies was common. Nearly half of HLA-B27-positive patients were not referred to rheumatology. Further efforts are needed to promote judicious use of HLA-B27 testing and optimize referral pathways to rheumatology.
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