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Association between positive lupus anticoagulant and elevated levels of factor VIII as an additional risk of thrombosis
Introduction. Lupus anticoagulant (LA), an autoantibody associated with thrombotic di sorders, interferes with coagulation tests. Elevated levels of factor VIII:C have been shown to constitute an independent thrombotic risk factor.
Objective. To associate factor VIII activity in patients with positive lupus anticoagulant with an additional risk of thrombosis.
Methodology. A descriptive cross-sectional study. 51 plasma samples with positive lupus anticoagulant were evaluated, with factor VIII:C and fibrinogen assays. Nonparametric statistical tests and the parallelism test were applied to confirm true deficiencies.
Results. 42 samples had normal factor VIII:C concentrations, 5 showed mild deficiency of this fac tor, and 4 showed elevated factor VIII:C levels. Of these, 2 also had elevated fibrinogen, and one had only elevated fibrinogen. The association between lupus anticoagulant and simultaneous elevation of Factor VIII:C and fibrinogen suggests significant thrombotic risk.
Conclusions. The results demonstrate the importance of a comprehensive clinical evaluation of patients receiving lupus anticoagulant therapy, considering factor VIII:C as a marker of thrombotic risk. The parallelism test is recommended to assess factor elevations and actual risk.
