Test for presence of anti-citrullinated protein (ACP) antibodies are highly specific (88-96%) for rheumatoid arthritis, about as sensitive as rheumatoid factor (70-78%) for diagnosis of RA, and are detectable from even before the onset of clinical disease.
Test za prisustvo antitela za citrulinisane proteine je veoma specifičan (88-96%) za reumatoidni artritis, što je slično senzitivnosti testa za reumatoidni faktor (70-78%), i promenljiv je i pre kliničkog početka bolesti.