The IRMM international measurement evaluation programme (IMEP): IMEP -4: Trace elements (Li, Cu, Zn) in serum
The aim of the international measurement evaluation programme (IMEP) is to give an objective picture of the state-of-the-practice (SoP) of analytical measurements by comparing them to a reference value obtained by a primary method of measurement and which hence is as traceable to the Système International (SI) system of measurements as can presently be achieved, and which in any case is independent from a human or political decision. In the fourth measurement round, IMEP -4, three trace elements: Li, Cu, Zu at three different levels in (bovine) serum, were measured by about 12 participating laboratories using their routine methods. The (coded) results are graphically reported and compared to certified reference values, established by an isotope-specific method, isotope dilution mass spectrometry (IDMS), defined as a primary method of measurement by the consultative committee on amount of substance. Results indicate a spread of more then +/- 50%, asymmetrically distributed around the reference value with its own uncertainty range, although the self-declared accuracy by the laboratories was between 5% and 10%. Self-assessment by participants of their analytical capabilities does not show a high correlation between the self-rating and the actual performance.
Bibliographic Reference: Article: Accreditation and Quality Assurance (1998)
Record Number: 199810900 / Last updated on: 1998-08-07
Original language: en
Available languages: en