TO TEST OR NOT TO TEST, THAT IS THE QUESTION

This paper describes a system that is used in Maastricht, the Netherla nds, to provide general practitioners with feedback about the adequate ness of their test requesting behaviour. The system has proven to be e ffective. Since the screening of test requests and additional patient data is work-intensive a project was started in the framework of the A IM programme OPENLABS to design a computer-based feedback system. In t his system the general practitioner sends test requests to the laborat ory decision support system by means of electronic data interchange (E DI). The authors were involved in the development of the EDI messages, which are now accepted standards in the Netherlands. The requests are stored in a database that is part of the laboratory decision support system. The other part of the decision support system, an expert syste m, obtains the request data (including patient data) from the database , screens the requests for adequateness and provides feedback when nec essary.