Talk:Interlaboratory Comparisons

1. Introduction

In this talk, information from EN ISO/IEC 17043 are selected and reported.
An interlaboratory comparison consists of organization, performance and evaluation of measurements or tests on the same or similar items by two or more laboratories in accordance with predetermined conditions.
Among the main goals of an interlaboratory comparison are:
1) evaluation of the performance of laboratories for specific tests or measurements;
2) monitoring laboratories' performance, identification of possible problems and initiation of actions for improvement;
3) establishment of the effectiveness and comparability of test or measurement methods;
4) identification of interlaboratory differences;
5) education of participating laboratories based on the outcomes of such comparisons;
6) validation of uncertainty claims;
7) evaluation of the performance characteristics of a method – often described as collaborative trials;
8) assignment of values to reference materials and assessment of their suitability for use in specific test or measurement procedures;
9) support for statements of the equivalence of measurements of National Metrology Institutes through “key comparisons” and supplementary comparisons conducted on behalf of the International Bureau of Weights and Measurement (BIPM) and associated regional metrology organizations.

Proficiency testing involves the use of interlaboratory comparisons for the determination of laboratory performance.
The need for ongoing confidence in laboratory performance is not only essential for laboratories and their customers but also for other interested parties, such as regulators, laboratory accreditation bodies and other organizations that specify requirements for laboratories.

2. References

The following referenced documents must be considered for a comprehensive view on interlaboratory comparisons.

2.1 Normative references

ISO/IEC 17043:2010, Conformity assessment - General requirements for proficiency testing.
ISO/IEC 17000:2004, Conformity assessment — Vocabulary and general principles.
ISO/IEC Guide 99:2007, International vocabulary of metrology — Basic and general concepts and associated terms (VIM)
ISO/IEC 17025:2017, General requirements for the competence of testing and calibration laboratories
ISO 13528:2015, Statistical methods for use in proficiency testing by interlaboratory comparison
ISO 21748:2017, Guidance for the use of repeatability, reproducibility and trueness estimates in measurement uncertainty evaluation

2.2 Publications

1. Metrological traceability of measurement results in chemistry: Concepts and implementation (IUPAC Technical Report) - Paul De Bièvre, René Dybkær, Aleš Fajgelj, D. Brynn Hibbert - Pure Appl. Chem., 2011, Vol. 83, No. 10, pp. 1873-1935. http://dx.doi.org/10.1351/PAC-REP-07-09-39

6. Literature on NMR interlaboratory comparisons

6.1 Series

1. “Validation of a 1D 1H-NOESY experiment for fingerprinting of grape juices” - Vito Gallo, Nicola Intini, Piero Mastrorilli, Mario Latronico, Stefano Todisco, Antonino Rizzuti, Rosa Ragone, Pasquale Scapicchio, Paolo Dambruoso, Mauro Andrea Cremonini, Francesca Benevelli, Stefano Ghelli - Volume 3, “NMR Inter-Laboratory Comparisons” Series, (July 2017), ISBN: 9788885494060, Ed.: NeP Edizioni, Rome

2. “Validation of NMR fingerprinting methods: effects of processing on measure reproducibility and laboratory performance assessment” - Vito Gallo, Nicola Intini, Piero Mastrorilli, Mario Latronico, Pasquale Scapicchio, Alessandra Milella, Antonino Rizzuti, Stefano Todisco, Antonello Pascazio, Maurizio Triggiani, Vitoantonio Bevilacqua, Carlos Cobas, Silvia Mari - Volume 2, “NMR Inter-Laboratory Comparisons” Series, (September 2016), ISBN: 9788899259709, Ed.: NeP Edizioni, Rome

3. “Validation of a 1D 1H-NOESY experiment for fingerprinting of wheat and flour” - Vito Gallo, Nicola Intini, Piero Mastrorilli, Mario Latronico, Pasquale Scapicchio, Mauro Andrea Cremonini, Francesca Benevelli, Alessandra Milella, Antonino Rizzuti, Isabella Cafagna - Volume 1, “NMR Inter-Laboratory Comparisons” Series, (September 2015), ISBN: 97888999259112, Ed.: NeP Edizioni, Rome

6.2 Journals

1. “Performance assessment in fingerprinting and multi component quantitative NMR analyses” - Vito Gallo, Nicola Intini, Piero Mastrorilli, Mario Latronico, Pasquale Scapicchio, Maurizio Triggiani, Vitoantonio Bevilacqua, Paolo Fanizzi, Domenico Acquotti, Cristina Airoldi, Fabio Arnesano, Michael Assfalg, Francesca Benevelli, Davide Bertelli, Laura R. Cagliani, Luca Casadei, Flaminia Cesare Marincola, Giuseppe Colafemmina, Roberto Consonni, Cesare Cosentino, Silvia Davalli, Sandra A. De Pascali, Virginia D’Aiuto, Andrea Faccini, Roberto Gobetto, Raffaele Lamanna, Francesca Liguori, Francesco Longobardi, Domenico Mallamace, Pierluigi Mazzei, Ileana Menegazzo, Salvatore Milone, Adele Mucci, Claudia Napoli, Thelma Pertinhez, Antonino Rizzuti, Luca Rocchigiani, Elisabetta Schievano, Fabio Sciubba, Anatoly Sobolev, Leonardo Tenori, Mariacristina Valerio - Analytical Chemistry, 87 (2015) 6709-6717.

2. "Validation of quantitative NMR" - Frank Malz, Harald Jancke - Journal of Pharmaceutical and Biomedical Analysis 38 (2005) 813–823.