| Summary: | Patients with immune thrombocytopenia (ITP) exhibit striking heterogeneity in bleeding manifestations even at similar platelet counts. We report the prevalence and impact of thrombophilia marker expression in chronic ITP patients. For the present study, patients with chronic ITP were clinically assessed at regular intervals using the bleeding assessment tool for ITP, and bleeding was compared among patients with and without thrombophilia marker expression (thrombophilia markers analyzed included clot-based assays for protein C, protein S, Pro C Global®, FVIII levels, and lupus anticoagulant assay). Thirty-six patients (25.5%) tested positive for at least one thrombophilia marker, and the remaining 105 patients (74.5%) were negative for all markers. Patients expressing at least one thrombophilia marker had significantly less bleeding than those without. We conclude that a part of heterogeneity in the clinical presentation of chronic ITP can be explained by the presence of thrombophilia.
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