What is repeatability and reproduceability

Repeatability and reproduceability are both used to evaluate the precision of analytical results. Most people do not make a strict distinction, and some literatures often use them together. But the actual meaning of repeatability and reproduceability is not the same. Repeatability is a larger concept than reproducibility and has a wide range of applications. Reproducibility has a small connotation and is generally used in "phenomenon".

Repeatability and reproduceability are common in foreign literature. The following describes the difference between repeatability and reproduceability:
Repeatability: the relative standard deviation between the results of repeated determinations of the same sample by the same laboratory and the same analytical method in a short period of time;
Reproducibility: The relative standard deviation between results measured by different analysts in different laboratories using the same assay on the same subject.