title: A new family with classical factor X deficiency as demonstrated by electroimmunoassay.
abstract: A new family with classical factor X deficiency is described. The proposita is a 6 year old girl who presented with occasional epistaxis and a hematoma after an intramuscular injection. The main laboratory features consisted in a prolongation of partial thromboplastin, prothrombin and Stypven clotting times corrected by the addition of normal serum. Factor X activity varied between 3 and 6%. Factor X amydolytic activity was 15% of normal. Electroimmunoassay failed to show the presence of factor X antigen. No inhibitor was found in the proposita plasma. Parents and other family members showed intermediate levels of factor X activity and antigen and were considered to be heterozygotes. No consanguineity was found in the family.
mesh_terms: D000941:Antigens / Q000032:analysis; D002648:Child; D002863:Chromogenic Compounds; D004568:Electrodiagnosis; D005170:Factor X / Q000276:immunology; D005171:Factor X Deficiency / Q000235:genetics*; D005260:Female; D006579:Heterozygote; D006801:Humans; D007020:Hypoprothrombinemias / Q000235:genetics*; D007118:Immunoassay; D011517:Prothrombin Time
chemical_list: D000941:Antigens; D002863:Chromogenic Compounds; D005170:Factor X