Abstract
There is evidence to support the notion that interlaboratory comparisons (ILCs) are an effective tool for laboratory improvement. However, despite widespread experience and anecdotal evidence of improvements there are few published studies demonstrating any benefits from ILCs– in any field of testing. Published demonstrations of benefits can help justify the growing use of ILCs. ILCs and proficiency testing have been common for many years in medical laboratories; there has been open information on the results of ILCs, and there has been standardization of results from thousands of laboratories. These studies show general improvement over time in several areas of testing in different countries. Many articles cite specific reasons for the improvements, either proven or supposed. An early version of this paper was presented at the International Laboratory Accreditation Cooperation Conference ”ILAC 2000” in Washington D.C., on 31October, 2000.
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