Trueness of measurement

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Trueness of measurement


Trueness of measurement is the closeness of agreement between the average value obtained from a large series of results of measurements and a true value (adapted from ISO 3534-1:1993, definition 3.12). The degree of trueness is usually expressed numerically by the statistical measure bias that is inversely related to trueness and is the difference between the expectation of the results of measurement and a true value of the measurand.

Reference: ISO 15189:2012 Medical laboratories — Particular requirements for quality and competence, ISO 17511:2003 In vitro diagnostic medical devices

MitoPedia concepts: MitoFit Quality Control System 

True value of a quantity: value consistent with the definition of a given particular quantity [SOURCE: VIM:1993, 1.19]. This is a value that would be obtained by a perfect measurement. True values are by nature indeterminate. The indefinite article "a", rather than the definite article "the", is used in conjunction with "true value" because there may be many values consistent with the definition of a given particular quantity. The 'definition of a given particular quantity' may have to include the measurement procedure applied. Therefore, a true value may depend on a specified measurement procedure.
Trueness control material: reference material that is used to assess the bias of measurement of a measuring system.