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While neurologists are familiar with and have access to routine lumbar punctures, there are nuances about the CSF tap test for NPH to consider in clinical practice. In this article, we describe our practice for CSF tap tests with reference to the current evidence and common pitfalls while accepting the limitation of the test itself.<\/jats:p>","DOI":"10.1136\/pn-2025-004922","type":"journal-article","created":{"date-parts":[[2026,6,12]],"date-time":"2026-06-12T17:20:34Z","timestamp":1781284834000},"page":"pn-2025-004922","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Cerebrospinal fluid tap test in normal pressure hydrocephalus"],"prefix":"10.1136","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-3849-6715","authenticated-orcid":false,"given":"Josephine","family":"Schena","sequence":"first","affiliation":[{"name":"Neurosciences, Imperial College Healthcare NHS Trust, London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-4197-8412","authenticated-orcid":false,"given":"Harvey","family":"Burns","sequence":"additional","affiliation":[{"name":"Department of Brain Sciences, Imperial College London, London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6245-1016","authenticated-orcid":false,"given":"Alexander","family":"Hayes","sequence":"additional","affiliation":[{"name":"Department of Brain Sciences, Imperial College London, London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Graeme","family":"Cossou","sequence":"additional","affiliation":[{"name":"Neurosciences, Imperial College Healthcare NHS Trust, London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-8461-5914","authenticated-orcid":false,"given":"Stephen","family":"Gunning","sequence":"additional","affiliation":[{"name":"Department of Neuropsychology, Imperial College Healthcare NHS Trust, London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9007-7017","authenticated-orcid":false,"given":"Christopher","family":"Carswell","sequence":"additional","affiliation":[{"name":"Neurology, Imperial College Healthcare NHS Trust, London, UK"},{"name":"Neurology, Chelsea and Westminster Hospital NHS Foundation Trust, London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2026,6,12]]},"reference":[{"key":"2026061210202274000_pn-2025-004922v1.1","doi-asserted-by":"publisher","DOI":"10.1016\/0022-510X(65)90016-X"},{"key":"2026061210202274000_pn-2025-004922v1.2","doi-asserted-by":"publisher","DOI":"10.1056\/NEJM196507152730301"},{"key":"2026061210202274000_pn-2025-004922v1.3","doi-asserted-by":"publisher","DOI":"10.1016\/j.wneu.2023.12.094"},{"key":"2026061210202274000_pn-2025-004922v1.4","doi-asserted-by":"crossref","first-page":"813","DOI":"10.1212\/cont.0000000000001577","article-title":"Radiographic Evaluation of Normal Pressure Hydrocephalus","volume":"31","author":"Cogswell","year":"2025","journal-title":"Continuum (Minneap Minn)"},{"key":"2026061210202274000_pn-2025-004922v1.5","doi-asserted-by":"crossref","unstructured":"Pearce R . 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