ANA Entry Criterion SLE — SCE Rheumatology MCQ

Correct answer: E — They cannot classify SLE because positive ANA at least once is the entry criterion, although clinical diagnosis remains separate

The best answer is “They cannot classify SLE because positive ANA at least once is the entry criterion, although clinical diagnosis remains separate”. A positive ANA at least once is the obligatory entry criterion for 2019 EULAR/ACR classification; classification is designed for research consistency and is not identical to a clinician’s diagnostic judgment. The remaining choices—“They classify SLE whenever renal biopsy shows any glomerulonephritis, after safety review, after specialist assessment, with clinical reassessment, because this is a supported alternative”, “They classify SLE after a therapeutic response to glucocorticoid, after specialist assessment, with clinical reassessment, within a rheumatology pathway”, “They require anti-dsDNA but rarely ANA, with clinical reassessment, within a rheumatology pathway, after safety review”, “They exclude lupus permanently from clinical consideration, within a rheumatology pathway, after safety review, after specialist assessment”—are credible in related rheumatology presentations, but each addresses a different diagnosis, investigation, treatment sequence or complication and does not fit the decisive findings in this stem.

Reference: EULAR recommendations for systemic lupus erythematosus: https://ard.bmj.com/content/83/1/15