In vitro differential inhibition of the factor XI activity assay in the setting of a lupus anticoagulant.

Autor:	Rabichow L; Hematology and Coagulation Laboratory., Dinh J; Hematology and Coagulation Laboratory., Nguyen L; Hematology and Coagulation Laboratory., Qiao J; Department of Pathology and Laboratory Medicine, University of California, Irvine, Orange, California, USA.
Jazyk:	angličtina
Zdroj:	Blood coagulation & fibrinolysis : an international journal in haemostasis and thrombosis [Blood Coagul Fibrinolysis] 2024 Jun 01; Vol. 35 (4), pp. 217-222. Date of Electronic Publication: 2024 Feb 14.
DOI:	10.1097/MBC.0000000000001287
Abstrakt:	Acquired factor XI deficiencies due to factor-specific inhibitors are rare and may be associated with lupus anticoagulant. We report a 63-year-old male with suspected postsurgical bleeding, prior surgical site infection, an isolated prolonged activated partial thromboplastin time, and a positive lupus anticoagulant. Although the factor II assay was normal, factor VIII and IX assays initially demonstrated nonparallelism with factor activity that consistently increased to normal reference ranges with serial dilutions. A discrepancy in factor XI activity results was discovered when the in-house method demonstrated undetectable activity (<3%); send-out testing using different instrument/reagent combinations revealed the presence of factor XI activity between 70% and 76%. The patient received surgical follow-up and was subsequently discharged home. Given the differential in vitro inhibition of factor XI activity on our initial in-house testing, this case highlights the importance of recognizing factor assay interference in the presence of a known lupus anticoagulant inhibitor, with strategies to mitigate potentially erroneous results. (Copyright © 2024 Wolters Kluwer Health, Inc. All rights reserved.)
Databáze:	MEDLINE
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