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We aim to obtain consensus on how expert clinicians recognise and diagnose VCD\/ILO.<\/jats:p><\/jats:sec><jats:sec id=\"sec002\"><jats:title>Methods and analysis<\/jats:title><jats:p>Two-round modified Delphi, with workshop validation.<\/jats:p><\/jats:sec><jats:sec id=\"sec003\"><jats:title>Ethics and dissemination<\/jats:title><jats:p>Institutional Board Review was obtained from the Monash Health Human Research Ethics Committee. The dissemination plan is for presentation and publication.<\/jats:p><\/jats:sec><jats:sec id=\"sec004\"><jats:title>Registration details<\/jats:title><jats:p>Registered at Australia and New Zealand Clinical Trials Registry ACTRN12621001520820p.<\/jats:p><\/jats:sec>","DOI":"10.1371\/journal.pone.0279338","type":"journal-article","created":{"date-parts":[[2022,12,29]],"date-time":"2022-12-29T18:24:47Z","timestamp":1672338287000},"page":"e0279338","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":8,"title":["Diagnosis of vocal cord dysfunction \/ inducible laryngeal obstruction\u2014A Delphi study protocol"],"prefix":"10.1371","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7409-9328","authenticated-orcid":true,"given":"Paul","family":"Leong","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anne E.","family":"Vertigan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark","family":"Hew","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Malcolm","family":"Baxter","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Debra","family":"Phyland","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"James H.","family":"Hull","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas L.","family":"Carroll","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter G.","family":"Gibson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vanessa M.","family":"McDonald","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philip G.","family":"Bardin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2022,12,29]]},"reference":[{"key":"pone.0279338.ref001","doi-asserted-by":"crossref","unstructured":"Dunglison R. 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