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Alpha-1-Fetoprotein (AFP): international proficiency study with different test systems
G M Oremek1, A Oertl, T Bertsch
1Johann Wolfgang Goethe Universität, Fachbereich Laboratoriumsmedizin, Frankfurt am Main, Germany. oremek@gmx.net
Background:
The present proficiency study aimed to elucidate the comparability and reliability of test systems for the determination of AFP concentrations.
Methods:
25 laboratories using 8 different commercial test systems used liquid BIOREF-AFP control serum in their routine internal quality control over a period of one year. For statistical analysis the results were collected centrally.
Results:
The statistical analysis of the test results revealed considerable variation for the different laboratories. The deviations of the mean values of different laboratories from the overall mean value varied between 0.1 and 26.1%, and for most of the laboratories the deviation was round about 10%. The precision of measured values in the individual laboratories was in most cases acceptable: Nevertheless, the coefficients of variation of the individual laboratories ranged from 13 to 16.1%.
Conclusions:
In conclusion, this study indicates that AFP results vary between different laboratories albeit an international standard for AFP is available. Therefore, every laboratory should participate in external ring studies and should use a quality control serum independent of the test kit manufacturer for the internal quality control.
