During routine participation in proficiency testing (PT), most laboratories will occasionally receive an unsatisfactory performance score for a specific analyte in a particular matrix. When this happens, laboratories are expected – and accredited laboratories are required – to investigate the root causes of the failure and implement any necessary corrective actions.
This white paper uses primary data collected by members of the AXIO team to investigate the reasons for poor performance in PT and how to monitor changing performance, whilst also providing checklists for maintaining performance and case studies that illustrate how poor performance has occurred.
