{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,22]],"date-time":"2026-10-22T01:42:10Z","timestamp":1792633330526,"version":"4.5.0"},"reference-count":19,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2024,2,6]],"date-time":"2024-02-06T00:00:00Z","timestamp":1707177600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Muscle and Nerve"],"published-print":{"date-parts":[[2024,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Introduction\/Aims<\/jats:title><jats:p>Line blot (LB) is in widespread use for myositis antibody detection. Yet, studies of its positive predictive value (PPV) in patients with suspected idiopathic inflammatory myopathy (IIM), which would be of particular relevance to neuromuscular clinicians, are lacking. We aimed to determine the PPV of myositis antibody LB testing in patients with suspected IIM, and examine whether PPV was significantly impacted by intensity of antibody positivity.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>This was a retrospective study of patients who underwent myositis antibody LB testing for suspected IIM between March 2019 and August 2022.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Of 70 patients who underwent testing for suspected IIM and had positive myositis antibody LB results, 43 (61%) were female and the median age was 61\u2009years (range: 10\u201383\u2009years). Forty\u2010four were classified as true\u2010positives, yielding a PPV of 63%. The PPV of patients with weak\u2010positive myositis antibody results (14\/30, 47%) was significantly lower than the PPV of patients with moderate\u2010positive or strong\u2010positive myositis antibody results (30\/40, 75%) (<jats:italic>p<\/jats:italic>\u2009=\u2009.02).<\/jats:p><\/jats:sec><jats:sec><jats:title>Discussion<\/jats:title><jats:p>Our study found that myositis antibody LB testing in patients with suspected IIM had a modest PPV, underscoring the need for antibody interpretation in the context of all available clinical and ancillary test data to avoid misdiagnosis. The significantly lower PPV in patients with weak\u2010positive results emphasizes the particular importance of clinical correlation in such patients. Further study into the diagnostic performance of various LBs for myositis antibody detection is needed to inform their interpretation in clinical practice.<\/jats:p><\/jats:sec>","DOI":"10.1002\/mus.28050","type":"journal-article","created":{"date-parts":[[2024,2,7]],"date-time":"2024-02-07T06:39:58Z","timestamp":1707287998000},"page":"626-630","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Positive predictive value of myositis antibody line blot testing in patients with suspected idiopathic inflammatory myopathy"],"prefix":"10.1002","volume":"69","author":[{"given":"Yiu\u2010Chia","family":"Chang","sequence":"first","affiliation":[{"name":"Department of Clinical Neurological Sciences Western University, London Health Sciences Centre  London Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liju","family":"Yang","sequence":"additional","affiliation":[{"name":"Department of Pathology and Laboratory Medicine Western University, London Health Sciences Centre  London Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4860-0470","authenticated-orcid":false,"given":"Adrian","family":"Budhram","sequence":"additional","affiliation":[{"name":"Department of Clinical Neurological Sciences Western University, London Health Sciences Centre  London Ontario Canada"},{"name":"Department of Pathology and Laboratory Medicine Western University, London Health Sciences Centre  London Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,2,6]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/nrrheum.2018.56"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.autrev.2018.10.004"},{"key":"e_1_2_11_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jim.2016.02.017"},{"key":"e_1_2_11_5_1","doi-asserted-by":"publisher","DOI":"10.3389\/fimmu.2019.00848"},{"key":"e_1_2_11_6_1","doi-asserted-by":"publisher","DOI":"10.1136\/annrheumdis-2018-214690"},{"key":"e_1_2_11_7_1","doi-asserted-by":"publisher","DOI":"10.1093\/rheumatology\/keq281"},{"key":"e_1_2_11_8_1","doi-asserted-by":"publisher","DOI":"10.1186\/s13075-020-02210-2"},{"key":"e_1_2_11_9_1","doi-asserted-by":"publisher","DOI":"10.1093\/jalm\/jfab127"},{"key":"e_1_2_11_10_1","doi-asserted-by":"publisher","DOI":"10.1111\/1756-185X.14174"},{"key":"e_1_2_11_11_1","doi-asserted-by":"publisher","DOI":"10.1177\/1759720X20975907"},{"key":"e_1_2_11_12_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00296-023-05279-5"},{"key":"e_1_2_11_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.nmd.2019.10.005"},{"key":"e_1_2_11_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.nmd.2017.09.016"},{"key":"e_1_2_11_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.nmd.2013.08.007"},{"key":"e_1_2_11_16_1","doi-asserted-by":"publisher","DOI":"10.1002\/art.40320"},{"key":"e_1_2_11_17_1","doi-asserted-by":"publisher","DOI":"10.1001\/jamaneurol.2022.4251"},{"key":"e_1_2_11_18_1","doi-asserted-by":"publisher","DOI":"10.1186\/s41927-020-00132-9"},{"key":"e_1_2_11_19_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pathol.2016.03.012"},{"key":"e_1_2_11_20_1","doi-asserted-by":"publisher","DOI":"10.1080\/08916934.2018.1441830"}],"container-title":["Muscle &amp; Nerve"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/mus.28050","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,6,4]],"date-time":"2025-06-04T13:08:01Z","timestamp":1749042481000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/mus.28050"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,2,6]]},"references-count":19,"journal-issue":{"issue":"5","published-print":{"date-parts":[[2024,5]]}},"alternative-id":["10.1002\/mus.28050"],"URL":"https:\/\/doi.org\/10.1002\/mus.28050","archive":["Portico"],"relation":{},"ISSN":["0148-639X","1097-4598"],"issn-type":[{"value":"0148-639X","type":"print"},{"value":"1097-4598","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,2,6]]},"assertion":[{"value":"2023-07-11","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2024-01-21","order":2,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2024-02-06","order":3,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}