Data from interlaboratory surveys for the determination of CA 125 (1987 to 1998) show large differences depending on the commercial kit used. Samples of the same material produced different analytical results in different interlaboratory surveys, thus showing that some kits did not have a satisfactory rate of reproducibility over a longer period of time.
KruseR., GeilenkeuserW-J, RöhleG.Interlaboratory surveys of the determination of tumour markers. Scatter and repeatability of the results.Eur J Clin Chem Clin Biochem1993; 31: 139–46.
2.
LamerzR.Allgemeine Kriterien zur Bestimmung von Tumormarkern im Labor und Anwendung in der Klinik.Lab Med1992; 16: 13–20.
3.
SchwartzM.K.Current status of tumour markers.Scand J Clin Lab Invest Suppl1995; 221: 5–14.