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An investigation into the laboratory control of anticoagulant therapy is presented. The cases were divided into those in the first few weeks of therapy and those on long-term treatment. Variations in the levels of factors VII and X, and factor IX were assessed. Thromboplastin levels were used to control therapy. These were compared with parallel estimations by Thrombotest and with the levels of the coagulation factors. Thrombotest was found to have no major advantage over thromboplastin.
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