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Symptoms include recurrent and chronic airway infections which can lead to deteriorating lung function and inflammatory destructive lung disease in the form of persistent atelectasis and bronchiectasis. Routine blood testing may be used as a tool for disease monitoring and management. However, currently there are no consensus-based guidelines within the field of PCD. BEAT-PCD together with the ERN-LUNG PCD-Clinical Trial Network aimed to develop an international expert consensus statement on which routine blood tests should be conducted in patients with PCD.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>An international panel of 33 PCD experts from 17 countries was established to generate consensus on routine blood testing in PCD. A modified Delphi technique with three e-survey rounds was used to reach consensus, which was defined as \u226580% agreement for each statement. Two patient representatives were included in the consensus process.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The expert panel reached consensus on 51 out of 101 statements (50%) on routine blood testing in children and adults with PCD to be performed at diagnosis, annually and on exacerbation. The statements include biomarkers for inflammation, haemoglobin, iron status, vitamin D, immune function, inhalant allergies, liver and kidney function, and allergic bronchopulmonary aspergillosis.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>This is the first international consensus on routine blood testing in PCD. It highlights blood tests that may be relevant to perform at diagnosis, annually and on exacerbation in people with PCD. Further research on the clinical usefulness of routine blood testing in PCD is needed.<\/jats:p><\/jats:sec>","DOI":"10.1183\/23120541.01071-2024","type":"journal-article","created":{"date-parts":[[2025,2,20]],"date-time":"2025-02-20T16:10:38Z","timestamp":1740067838000},"page":"01071-2024","update-policy":"https:\/\/doi.org\/10.1183\/ers-crossmark-policy","source":"Crossref","is-referenced-by-count":7,"title":["International consensus statement on routine blood testing in primary ciliary dyskinesia"],"prefix":"10.1183","volume":"11","author":[{"given":"Sarah","family":"Altaraihi","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4420-3091","authenticated-orcid":false,"given":"June 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