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Quantitative Risk for Single-Positive Lupus Anticoagulant Results With Different Anticoagulants.
American Journal of Clinical Pathology 2023 March 21
OBJECTIVES: Clinical experts recommend against testing for lupus anticoagulant (LAC) during anticoagulation.
METHODS: We quantitated the risk of a single-positive dilute Russell viper venom time (dRVVT) result or partial thromboplastin time-based phospholipid neutralization (PN) result on anticoagulation.
RESULTS: Any anticoagulation led to a fourfold greater likelihood of single-positive results, primarily by rivaroxaban (odds ratio [OR] = 8.6) and warfarin (OR = 6.6), resulting in a positive dRVVT test with a normal PN test. Heparin and apixaban were twofold more likely to show single-positive results, but enoxaparin did not show significant single positivity.
CONCLUSIONS: Our results quantitatively support experts' avoidance of LAC testing during anticoagulation.
METHODS: We quantitated the risk of a single-positive dilute Russell viper venom time (dRVVT) result or partial thromboplastin time-based phospholipid neutralization (PN) result on anticoagulation.
RESULTS: Any anticoagulation led to a fourfold greater likelihood of single-positive results, primarily by rivaroxaban (odds ratio [OR] = 8.6) and warfarin (OR = 6.6), resulting in a positive dRVVT test with a normal PN test. Heparin and apixaban were twofold more likely to show single-positive results, but enoxaparin did not show significant single positivity.
CONCLUSIONS: Our results quantitatively support experts' avoidance of LAC testing during anticoagulation.
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