title: A family with heterozygous factor X Friuli defect outside Friuli.
abstract: Three members of the same family were found to have a clotting defect consistent with the diagnosis of heterozygous factor X Friuli disorder. The main features of the defect were a mild prolongation of prothrombin time and partial thromboplastin time, but a normal Stypven-Cephalin clotting time. Factor X activity was 40-50% of normal using tissue thromboplastin, but was perfectly normal using Russell's viper venom and cephalin. Using chromogenic substrate S-2222 the level was 30% of normal. Immunologically, factor X was normal. Bleeding manifestations were mild if any. The hereditary pattern was autosomal. The family comes from an area far away from Friuli and represents the first example of factor X Friuli discovered outside the Friuli.
mesh_terms: D000328:Adult; D001778:Blood Coagulation Disorders / Q000453:epidemiology / Q000235:genetics*; D002648:Child; D005170:Factor X; D005260:Female; D006579:Heterozygote; D006801:Humans; D007558:Italy; D010314:Partial Thromboplastin Time; D010375:Pedigree; D011517:Prothrombin Time
chemical_list: D005170:Factor X