Method detection limit The minimum concentration of a substance that can be distinguished from the absence of that substance within a stated confidence limit (generally 1%) given a particular analytical method. Definition adapted from Wikipedia. See http://en.wikipedia.org/wiki/Detection_limit. Precision Definition adapted from Wikipedia. See http://en.wikipedia.org/wiki/Accuracy_and_precision The degree to which repeated measurements under unchanged conditions show the same results. This describes a numeric value below which measured values should be considered suspect. This numeric value should be empirically derived. Physical limit lower bound This describes a numeric value above which measured values should be considered suspect. This numeric value should be empirically derived. Physical limit upper bound ODM2 Working Group ODM2 Controlled Vocabulary Data Quality Type CV A vocabulary for describing the type of data quality information provided for a particular Result. Examples include the accuracy or precision of the data values within the Result. The degree of closeness of a measurement of a quantity to that quantity's true value. Definition adapted from Wikipedia. See http://en.wikipedia.org/wiki/Accuracy_and_precision Accuracy The smallest concentration of analyte that can be reported by laboratory. Reporting level