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Older adult mental health services are used to managing complexity, but the range of pathologies presenting with unusual symptoms that may mimic autoimmune encephalitis is wide and there is no clear guidance as to when and how to investigate for possible autoimmune encephalitis. This paper examines the evidence supporting investigation and management strategies for patients with possible autoimmune encephalitis presenting to older adult psychiatrists.<\/jats:p>","DOI":"10.1136\/ebmental-2019-300110","type":"journal-article","created":{"date-parts":[[2019,9,19]],"date-time":"2019-09-19T17:15:31Z","timestamp":1568913331000},"page":"172-176","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":9,"title":["Autoimmune encephalitis in the elderly: who to test and what to test for"],"prefix":"10.1136","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2109-3544","authenticated-orcid":false,"given":"Sophie","family":"Behrman","sequence":"first","affiliation":[{"name":"Oxford Health NHS Foundation Trust, Oxford, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Belinda","family":"Lennox","sequence":"additional","affiliation":[{"name":"Psychiatry, University of Oxford, Oxford, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2019,9,19]]},"reference":[{"key":"2025082623172257000_22.4.172.1","doi-asserted-by":"publisher","DOI":"10.1093\/brain\/awh077"},{"key":"2025082623172257000_22.4.172.2","doi-asserted-by":"publisher","DOI":"10.1212\/WNL.0000000000002637"},{"key":"2025082623172257000_22.4.172.3","doi-asserted-by":"publisher","DOI":"10.1136\/jnnp-2016-314758"},{"key":"2025082623172257000_22.4.172.4","doi-asserted-by":"publisher","DOI":"10.1002\/ana.21050"},{"key":"2025082623172257000_22.4.172.5","doi-asserted-by":"publisher","DOI":"10.1016\/S1474-4422(15)00401-9"},{"key":"2025082623172257000_22.4.172.6","doi-asserted-by":"crossref","first-page":"90","DOI":"10.1176\/jnp.23.1.jnp90","article-title":"The emerging link between autoimmune disorders and neuropsychiatric disease","volume":"23","author":"Kayser","year":"2011","journal-title":"J Neuropsychiatr"},{"key":"2025082623172257000_22.4.172.7","doi-asserted-by":"crossref","DOI":"10.3389\/fneur.2018.00841","article-title":"Detection methods for autoantibodies in suspected autoimmune encephalitis","volume":"9","author":"Ricken","year":"2018","journal-title":"Front Neurol"},{"key":"2025082623172257000_22.4.172.8","doi-asserted-by":"publisher","DOI":"10.1093\/brain\/83.3.357"},{"key":"2025082623172257000_22.4.172.9","doi-asserted-by":"crossref","unstructured":"Al-Diwani A , Pollak TA , Langford AE , et al . 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