{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,3]],"date-time":"2025-10-03T08:18:54Z","timestamp":1759479534812},"reference-count":15,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2005,11,29]],"date-time":"2005-11-29T00:00:00Z","timestamp":1133222400000},"content-version":"vor","delay-in-days":6482,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Arthritis &amp; Rheumatism"],"published-print":{"date-parts":[[1988,3]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Rheumatoid factor (RF) test results reported in the College of American Pathologists' surveys for 1983\u20131985 lacked inter\u2010laboratory reliability and mutual validity. Using the 4 most popular commercial kits for RF testing, participating laboratories consistently identified as \u201cpositive\u201d or \u201cnegative\u201d all but the weakly positive samples. A wide range of titers was reported on qualitative testing, however. One popular kit using a modified sheep red blood cell agglutination technique yielded results that differed markedly from those with other kits. Investigators apparently have paid little attention to these discrepancies. In <jats:italic>Arthritis &amp; Rheumatism<\/jats:italic>, from 1983 to 1985, over 50% of the articles that referred directly or indirectly to RFs omitted details of RF methodology. Until a reliable RF test is adopted, it is essential that such methodologic information be specified.<\/jats:p>","DOI":"10.1002\/art.1780310317","type":"journal-article","created":{"date-parts":[[2007,2,14]],"date-time":"2007-02-14T22:13:48Z","timestamp":1171491228000},"page":"432-435","source":"Crossref","is-referenced-by-count":8,"title":["Common tests for rheumatoid factors: poorly standardized but ubiquitous"],"prefix":"10.1002","volume":"31","author":[{"given":"David H.","family":"Goddard","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mary E.","family":"Moore","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2005,11,29]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9343(79)91055-6"},{"key":"e_1_2_1_3_2","doi-asserted-by":"publisher","DOI":"10.1136\/ard.16.1.118"},{"key":"e_1_2_1_4_2","doi-asserted-by":"publisher","DOI":"10.1002\/1529-0131(195902)2:1<16::AID-ART1780020104>3.0.CO;2-9"},{"key":"e_1_2_1_5_2","first-page":"324","volume-title":"Proposed diagnostic criteria for use in population studies: active rheumatoid arthritis, The Epidemiology of Chronic Rheumatism. 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