Direct oral anticoagulants‐Remove versus Taipan snake venom time for detection of a lupus anticoagulant in patients taking oral direct factor Xa inhibitors

White, Danielle ORCID logoORCID:, Moore, Gary W. ORCID logoORCID:, Besser, Martin, MacDonald, Stephen and Thomas, Will ORCID logoORCID: (2022) Direct oral anticoagulants‐Remove versus Taipan snake venom time for detection of a lupus anticoagulant in patients taking oral direct factor Xa inhibitors. Research and Practice in Thrombosis and Haemostasis, 6 (1) , e12648. pp. 1-8. ISSN 2475-0379 [Article] (doi:10.1002/rth2.12648)

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Background: The optimal method of detecting a lupus anticoagulant (LA) for patients taking direct factor Xa inhibitor (DFXaI) direct oral anticoagulants (DOACs) remains controversial. Methods include charcoal adsorption of the DOACs to allow testing with the activated partial thromboplastin time (APTT) and dilute Russell viper venom time (dRVVT), or use of the DFXaI‐insensitive Taipan snake venom time (TSVT) and Ecarin time (ET) assays on neat plasma. Objectives: The objective was to compare the utility of APTT and dRVVT analysis following DOAC Remove against TSVT/ET on untreated plasma for LA detection in spiked plasmas and routine clinical samples for patients on DFXaIs. Patients/methods: Various LA‐negative and LA‐positive samples were assayed by APTT, dRVVT, and TSVT/ET, and then separately spiked with rivaroxaban, apixaban, and edoxaban calibrators to a concentration of ~190 ng/ml and the assays repeated on spiked plasma before and after DOAC Remove treatment. Testing of 284 consecutive samples from DFXaI‐anticoagulated patients by APTT/dRVVT and TSVT/ET before and after DOAC Remove treatment was undertaken. Results: In the spiking model, we found that both TSVT/ET and DOAC Remove strategies generally distinguished LA‐negative and LA‐positive samples, but some false‐positive LA results occurred. In the investigation of 284 consecutive patient samples on DFXaIs, the percentage agreement for LA detection in neat samples tested by TSVT/ET versus APTT and dRVVT after DOAC Remove treatment was 90% (Cohen kappa 0.12). Conclusion: Our data highlight uncertainty and disagreement for testing LA in patients on DFXaI. Further studies are required.

Item Type: Article
Keywords (uncontrolled): ORIGINAL ARTICLE, antiphospholipid syndrome, charcoal adsorption, DOAC Remove™, factor Xa inhibitor, lupus anticoagulant, Taipan snake venom time
Research Areas: A. > School of Science and Technology
Item ID: 34597
Notes on copyright: © 2022 The Authors. Research and Practice in Thrombosis and Haemostasis published by Wiley Periodicals LLC on behalf of International Society on Thrombosis and Haemostasis (ISTH).
This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
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Depositing User: Jisc Publications Router
Date Deposited: 24 Jan 2022 10:25
Last Modified: 03 Feb 2022 10:25

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