Measurement of drug concentrations in physiological fluids is increasingly becoming part of the routine management of drug therapy, thus calling for particular care to ensure reliability and avoid misguided management. As part of a long-term national project to set up a network of hospitals where clinical chemists, pharmacists, and physicians could interact and evaluate their activities in connection with therapeutic drug monitoring, the results of a quality control scheme for antiepileptic drugs, which included 50 national hospital laboratories, are described here.
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