title: [IgM, IgG and IgA rheumatoid factors in rheumatoid arthritis].
abstract: The IgM, IgG and IgA rheumatoid factors (RF) were studied by ELISA in the serum of 122 patients with rheumatoid arthritis (RA) associating the Waaler-Rose test results, with the clinical and radiological aspects of the disease. 75 patients (61%) had RF IgM positive according to the Waaler-Rose test while the ELISA showed positive in 104 (85%). The RF (IgG was positive in 64 cases (52%) and RF IgA in 82 (67%). The levels of RF IgA were correlated to RF IgM levels, determined by the Waaler-Rose test (p < 0.01) and ELISA (p < 0.001), while RF IgG levels were not correlated to RF IgM or IgA. There was a significant correlation between RF IgA titles and Lansbury's index (p < 0.01), and between RF IgG and sedimentation rate (p < 0.01). In patients with extraarticular disease high levels of RF have been observed, especially RF IgM and IgA. We concluded that the ELISA technique is the preferred method to measure the RF.
authors.forename: A
authors.initials: A
authors.lastname: Naranjo Hernández
authors.forename: M A
authors.initials: MA
authors.lastname: Muniain Ezcurra
authors.forename: M C
authors.initials: MC
authors.lastname: Vargas Lebrón
authors.forename: J M
authors.initials: JM
authors.lastname: Rodríguez Barrera
authors.forename: J
authors.initials: J
authors.lastname: Prieto Martínez
authors.forename: F
authors.initials: F
authors.lastname: Navarro Sarabia
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000372:Agglutination Tests; D001172:Arthritis, Rheumatoid / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D007070:Immunoglobulin A / Q000097:blood*; D007074:Immunoglobulin G / Q000097:blood*; D007075:Immunoglobulin M / Q000097:blood*; D008297:Male; D008875:Middle Aged; D012217:Rheumatoid Factor / Q000097:blood*
chemical_list: D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D012217:Rheumatoid Factor
vernacular_title: Factores reumatoides IgM, IgG e IgA en la artritis reumatoide.