Role of external quality assurance schemes in assessing and improving quality in medical laboratories.

Medical laboratories have a long tradition of external quality assessment. Starting from pure quality control of laboratory performances, most external quality schemes in Europe evolved into a powerful tool for improving quality of clinical outcome of results. External quality assurance in medical laboratories not only includes laboratory performance evaluation, but also evaluation of method performance, post-market vigilance, training and help. In the future, the quality of programmes will further be improved by accreditation of schemes international collaboration and by using IT applications.