Atomic Absorption Spectroscopy or ICP-MS
umol per kg dry weight.
Statistical analysis is used to convert the participants results to a Z score which can then be used to identify questionable or outlier results by a robust statistical procedure (any results outside of +/-3 SDs of the mean is discounted). The z-score analysis is based on calculation of mean and standard deviation values.
Authorised reports are published electronically. These show intended results, results from all participants and contain a link to Histograms.
Freeze dried powdered liver tissue samples
Non-infectious substance. UK - normal post. Overseas - courier. Courier delivery will incur additional costs. Please contact the QA unit
Various aspects of the Proficiency testing schemes may at times be subcontracted. When this occurs it is placed with a competent subcontractor and the Quality Assurance Unit is responsible to the scheme participants for the subcontractors work.
ISO/IEC 17043: 2010 Conformity assessment – General requirements for proficiency testing.