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An amidolytic assay for factor VII, modified from the method of Seligsohn et al (1978), has been compared with the results of the prothrombin time using British Comparative Thromboplastin, Thronbotest and a clotting assay for factor VII. In ‘long-term’ oral anticoagulant administration agreement with the conventional methods was good and better than in our previous study when amidolytic assays for factors II and X respectively were studied (Latallo et al 1981). The method appeared to be reasonably specific for factor VII.  On the present evidence the chromogenic assay for factor VII offers a limited but apparently dependable guide to dosage but it is elaborate to perform and difficult to standardise. The main limiting factor for its routine application is the need to prepare a purified factor X extract.

An Assessment Of An Amidolytic Assay For Factor VII In The Laboratory Control Of Oral Anticoagulants