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Patient pathways were analysed in unplanned routes (acute admission up to 1\u2009month's prior diagnosis) and elective routes (other routes, e.g., cancer patient pathways).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Female patients in unplanned diagnostic pathways had more contacts to general practice from 19\u2009months before the diagnosis compared to their matched references; with IRR increasing from 1.14 (95% confidence interval (CI) 1.05\u20131.24) to 2.27 (95% CI 2.13\u20132.41) at 30\u201360\u2009days before the diagnosis. Female patients had more point\u2010of\u2010care tests, hospital contacts and radiological investigations at 17, 24 and 17\u2009months, respectively, before diagnosis compared to their references. Similar patterns were seen for male patients, although with a later onset of increase. No healthcare use variations were seen between patients diagnosed in unplanned versus elective pathways.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Increased healthcare utilisation was seen in general practice and hospitals up to 24\u2009months preceding a diagnosis, which may indicate a diagnostic window for detecting haematological cancer earlier.<\/jats:p><\/jats:sec>","DOI":"10.1111\/ejh.14315","type":"journal-article","created":{"date-parts":[[2024,11,13]],"date-time":"2024-11-13T12:14:04Z","timestamp":1731500044000},"page":"353-364","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Diagnostic Window Prior to a Haematological Cancer Diagnosis and the Association With Patient Pathways: A Nationwide Register\u2010Based Cohort Study on Healthcare Utilization in Denmark"],"prefix":"10.1111","volume":"114","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4877-2697","authenticated-orcid":false,"given":"Line Flytkj\u00e6r","family":"Virgilsen","sequence":"first","affiliation":[{"name":"Research Unit for General Practice  Aarhus Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter","family":"Vedsted","sequence":"additional","affiliation":[{"name":"Research Unit for General Practice  Aarhus Denmark"},{"name":"Diagnostic Centre, University Clinic for Innovative Patient Pathways, Silkeborg Regional Hospital &amp; Department of Clinical Medicine Aarhus University  Aarhus Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Henry","family":"Jensen","sequence":"additional","affiliation":[{"name":"Danish Clinical Quality Program\u2014National Clinical Registries (RKKP)  Aarhus Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8905-0220","authenticated-orcid":false,"given":"Henrik","family":"Frederiksen","sequence":"additional","affiliation":[{"name":"Department of Haematology Odense University Hospital &amp; University of Southern Denmark  Odense Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tarec Christoffer","family":"El\u2010Galaly","sequence":"additional","affiliation":[{"name":"Department of Haematology Odense University Hospital &amp; University of Southern Denmark  Odense Denmark"},{"name":"Department of Haematology Clinical Cancer Research Centre, Aalborg University Hospital  Aalborg Denmark"},{"name":"Department of Medicine, Clinical Epidemiology Division Karolinska Institutet  Stockholm Sweden"},{"name":"Department of Clinical Medicine Aarhus University  Aarhus Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Linda Aagaard","family":"Rasmussen","sequence":"additional","affiliation":[{"name":"Research Unit for General Practice  Aarhus Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,11,13]]},"reference":[{"key":"e_1_2_12_2_1","doi-asserted-by":"crossref","unstructured":"P. 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