Defining Accuracy, Precision and Trueness

Increased usage sometimes causes definitions to become tainted. In the laboratory, two terms which are often used interchangeably are accuracy and precision, or inaccuracy and imprecision. These, in fact, are different terms with very distinct meanings. Knowing the true definition, influences upon, and importance of each is critical to the development of a sound quality control program in the laboratory. This application note explains how sound quality control program assures the reliability of your results, allows the interchangeability of results between laboratories, reduces the likelihood of expensive repeat testing, and, in a worst case scenario, could prevent failed inspection or the questioning of vital research data.