The quality of a test whereby repetition of the same protocol and procedures yields the same or closely similar results or responses each time. This is an important criterion of tests used in clinical diagnosis. The distinction between repeatability and reliability is that the latter is a property of the measuring instrument, whereas repeatability is determined by interaction of the observer, the subject, and the instrument. See also replication and reproducibility, which are similar but not identical concepts.
Subjects: Public Health and Epidemiology.