Interassay
Interassay is a term used in analytical chemistry and bioassays to describe the variation in measurements obtained when an assay is performed in separate runs, on different days, by different operators, or with different instrument setups. It is a measure of between-run or between-assay precision and is contrasted with intra-assay variation, which arises within a single run.
To quantify interassay performance, multiple independent runs are conducted on the same samples and the results
Factors contributing to interassay variability include reagent lot differences, calibration and instrument performance, operator technique, ambient
In regulatory and validation contexts, interassay precision is part of an overall assessment of assay reliability