title: Further evaluation of an automated amidolytic factor X assay in monitoring anti-vitamin K treatment.
abstract: A mechanized factor X assay was tested in 2222 plasma samples of patients being treated with oral anticoagulants. The correlation coefficient between this assay and Thrombotest was 0.78. The therapeutic range for factor X amidolytic activity was 150 to 300 units/l. Amidolytic factor X activity and Thrombotest provide similar information about the state of anticoagulation within the same patient, including patients that are not well balanced. The ranges for factors II, VII, IX and X clotting activity in 57 patients on long-term therapy (Thrombotest within the therapeutic range between 190 and 95 s) were 80-300, 70-600, 40-420 and 50-330 units/l, respectively. The range for factor X amidolytic activity in this group of patients was 150-470 units/l.
mesh_terms: D000925:Anticoagulants / Q000627:therapeutic use*; D001780:Blood Coagulation Tests; D005164:Factor IX / Q000032:analysis; D005167:Factor VII / Q000032:analysis; D005170:Factor X / Q000032:analysis*; D006801:Humans; D008134:Long-Term Care; D011516:Prothrombin / Q000032:analysis; D011517:Prothrombin Time; D013927:Thrombosis / Q000188:drug therapy*; D014812:Vitamin K / Q000037:antagonists & inhibitors*
chemical_list: D000925:Anticoagulants; D014812:Vitamin K; D005167:Factor VII; D011516:Prothrombin; D005164:Factor IX; D005170:Factor X