Objective: The aim of this study was to examine appropriate utilization of antinuclear antibody (ANA) screening tests with follow-up subserology tests (reflex testing) for diagnosing systemic autoimmune rheumatic disorder (SARD).
Methods: We conducted a retrospective chart review of 3003 SARD-test orders at an academic teaching hospital from January to December 2019. Testing patterns were categorized as American College of Rheumatology (ACR)-recommended reflex testing, panel testing, or single subserology testing. We described testing patterns, assessed their diagnostic accuracy, and explored factors associated with reflex testing.
Results: Reflex testing accounted for 79.7% of SARD test-ordering, whereas improper testing (panel or single subserology) accounted for the other 20.3%. Reflex testing was associated with significantly more SARD diagnoses than improper testing (P = .004). Testing patterns were significantly associated with race/ethnicity (P = .008), with reflex testing being less frequent than improper testing in Hispanics and Whites.
Conclusion: In summary, one-fifth (20.3%) of testing patterns for suspected SARD did not follow the ACR-recommended guidelines for using reflex testing. Use of reflex testing was associated with an increased frequency of SARD diagnosis.
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