[Methods for assessing reliability and agreement of measurement].

Repeatedly in clinical and laboratory practice one undertakes a repeated measurements on the same objects examined with the same or different techniques. This usually occurs when through multiple measurements we wish to obtain a more reliable result or we compare the results obtained with two or more methods. This raises the question about the reliability of the results and their agreement . The article presents the effective methods for the quantification of these parameters for variables measured in at least interval scale. Theoretical concepts were illustrated with a specific example of clinical studies in neonatology.