Repeatability is the degree of agreement between results of independent measurements of the same analyte performed under the following conditions:
- the same measurement method
- same processor
- same instrument
- same place
- the same experimental conditions
- Repetition of the measurements within short time intervals
Repeat conditions are usually present when a sample is examined several times in quick succession with the same accessory. In contrast to the comparative precision , the boundary conditions are clearly defined more precisely.
Repeatability is a property of the process, not the result. It is calculated by multiplying the standard deviation of the individual results by a tabulated factor. For a confidence level of 95% the factor is 2.8. Ideally, at least eight individual measurements should be carried out.