AOAC GFA Stakeholder Program Meeting Book (August 27, 2023)

Current Definition VIM4 Second Committee Draft Definition

3.22 Measurement range: The concentration range over which the target analyte can be reliably quantified/detected

measuring interval working interval

interval of values of quantities that can be measured by a given measuring system with specified uncertainty NOTE 1 In some fields, the terms “measuring range” or “measurement range” are used for referring to measuring intervals. NOTE 2 The lower limit of a measuring interval should not be confused with detection limit. measurement precision precision closeness of agreement among indications or measured values obtained by replicate measurements on the same or similar objects under specified conditions NOTE 1 Measurement precision is sometimes interpreted as closeness of a random measurement error to zero. In this case, closeness is often reported quantitatively in terms of standard deviation, variance, coefficient of variation or precision limits under the specified conditions of measurement. NOTE 2 Measurement precision is customarily thought of as pertaining to either 1) a measurement procedure, 2) a measuring instrument or a measuring system, or 3) a set of indications or measured values. NOTE 3 The specified conditions mentioned in the definition can be, for example, repeatability conditions of measurement, intermediate precision conditions of measurement, or reproducibility conditions of measurement. The specified conditions typically relate to, but are not necessarily limited to, measurement method, measurement procedure, measuring system, measuring system operator, operating conditions, period of time and measurement location. The specification of the conditions should include what the changes are, to the extent practical. NOTE 4 Measurement precision may be evaluated by replicate measurements on similar objects, provided that variability among the objects is negligible

3.23 Precision: The closeness of agreement between independent test results under stipulated conditions. (ISO 5725-1)