Definitions


220. interference The effect of substances present in samples or sample matrix that reduce the accuracy and/or precision of an analytical measurement.


221. interim data A report of results and their evaluation based on analyses performed during the course of a trial or experiment prior to their completion.


222. intermediate precision A measure of precision that reflects within-laboratory variations: different days, different analysts and different equipment, among others.


223. internal standard Test substance(s) (e.g., a physicochemically similar analogue or stable isotope-labeled compound) added to calibration standards, quality control samples (QCs) and study samples at a known and constant concentration to correct for experimental variability during sample preparation and analysis.


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