WHO external quality assurance assessment scheme phase 9

The participation of Pharmaceutical Quality Control Laboratories (PQCLs) in appropriate proficiency testing schemes is an internationally recognised requirement1&2 as this enables the PQCL to demonstrate, monitor and improve the quality of the analytical services provided. Proficiency testing covers the overall performance of a laboratory, evaluating the process from the reception and storage of samples, the experimental work in the laboratory, the interpretation and the transcription of the data and the conclusions to the reporting sheets. Failure at any of these stages also reflects on the competence of the respective laborator