Patient self-testing and self-management of oral anticoagulation.

The development of portable instruments for measuring the prothrombin time (PT) in capillary whole blood has made it possible for patients on lifelong coumarin therapy to monitor the effect of the anticoagulant themselves (patient self-testing) and to adjust the dosage if necessary on their own (patient self-management). Dosage variations between individual patients and the narrow therapeutic range of the anticoagulant account for the need to monitor its effect, in order to minimize the risk of thromboembolism resulting from inadequate anticoagulation as well as the risk of bleeding due to overanticoagulation. This review focuses on the prerequisites for the successful implementation of patient self-testing and self-management, such as the selection of eligible patients, appropriate training and the reliability of available instruments. The outcomes of relevant clinical studies involving patient self-testing and self-management are also discussed.