Determination of myeloperoxidase in EDTA plasma: comparison of an enzyme-linked immunosorbent assay with a chemiluminescent automated immunoassay.

Background: The increased demand in clinical chemistry laboratories for determination of myeloperoxidase (MPO) as a potential marker for cardiovascular diseases has led to the development of several analytical methods, especially enzyme-linked immunosorbent assay (ELISA, e. g. from Immundiagnostik AG), and recently a new chemiluminescent automated immunoassay (CMIA, Architect MPO assay, Abbott Diagnostics).

Methods: We compared data from 115 patients obtained from an ELISA reference method (Immundiagnostik AG) with data obtained from the automated Architect MPO assay.

Results: The new MPO assay from Abbott Diagnostics correlates well with the ELISA (y=0.767x+7.035; R(2)=0.9204). The difference plot according to Bland-Altman analysis shows a mean bias of -1.048 microg/l, with a probability of 95%.

Conclusions: The Architect MPO assay can easily be adapted to the Architect instrument system and it is advantageous as far as technology and analysis time are concerned. This new automated MPO assay shows excellent analytical performance and provides a precise and convenient automated method for the measurement of MPO.