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Antiperinuclear factors are present in polyarthritis before ACR criteria for rheumatoid arthritis are fulfilled
Abstract
OBJECTIVE To show that antiperinuclear factor (APF) may be useful for the diagnosis of rheumatoid arthritis at a time when the American College of Rheumatology (ACR) criteria are not yet fulfilled.
METHODS Testing for APF-IgG (1:100 threshold) and rheumatoid factors (RF) was done in 60 patients with polyarthritis of recent onset during a three year follow up.
RESULTS At the end of the study, 21/40 rheumatoid arthritis were positive for RF and 31/40 for APF, including 18/40 cases (45%) in which ACR criteria were not yet fulfilled.
CONCLUSIONS APF are useful in the diagnosis of early rheumatoid arthritis.
- antiperinuclear factor
- rheumatoid arthritis
- profilaggrin
- ACR diagnostic criteria.