The establishment of EVISA is funded by the EU through
the Fifth Framework Programme (G7RT- CT- 2002- 05112).
Supporters of EVISA includes:
A method validation experiment
performed to estimate proportional systematic error. A test sample is
prepared by adding a standard solution of the analyte of interest to an
aliquot of a patient specimen. A baseline sample is prepared by adding
an equal amount of diluent or solvent to the same patient specimen. The
two samples are analyzed and recovery estimated from the difference
observed between the two samples divided by the amount added.