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The\n                    <jats:styled-content style=\"fixed-case\">UK<\/jats:styled-content>\n                    National Institute for Health and Care Excellence recommends a pre\u2010operative clotting test for patients with a history of abnormal bleeding. Anaesthetists are familiar with the prothrombin time assay, used to monitor warfarin effect, but anaesthetists may be less familiar with the activated partial thromboplastin time (\n                    <jats:styled-content style=\"fixed-case\">APTT<\/jats:styled-content>\n                    ), which tests the function of the \u2018intrinsic\u2019 clotting pathway. The activated partial thromboplastin time may be prolonged due to contamination, anticoagulant therapy, clotting factor deficiencies, lupus anticoagulant or acquired inhibitors of specific clotting factors. A prolonged activated partial thromboplastin time should lead to: further testing to exclude heparin contamination or therapy, mixing studies to identify factor deficiencies and if necessary dynamic studies, such as the dilute Russell's viper venom time and the Actin\n                    <jats:styled-content style=\"fixed-case\">FS<\/jats:styled-content>\n                    \u2010activated partial thromboplastin time, to identify direct factor inhibitors. These tests identify abnormalities and their implications for bleeding, helping anaesthetists and haematologists to manage haemostasis for individual patients.\n                  <\/jats:p>","DOI":"10.1111\/anae.14344","type":"journal-article","created":{"date-parts":[[2018,10,13]],"date-time":"2018-10-13T10:49:42Z","timestamp":1539427782000},"page":"1557-1563","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Implications of deranged activated partial thromboplastin time for anaesthesia and surgery"],"prefix":"10.1111","volume":"73","author":[{"given":"E.","family":"Loizou","sequence":"first","affiliation":[{"name":"St Helens and Knowsley NHS Foundation Trust Liverpool UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D. 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