Human serum samples were evaluated for oxidative stress with the d-ROMs test. The ceruloplasmin (CP) and copper contents of the samples was independently measured and compared to those calculated on the basis of the d-ROMs test results for pure CP solutions. The d-ROMs readings did not show any significant correlation with either the CP or copper contents of the samples. Critical interference of CP on the d-ROMs test was therefore excluded and the usefulness of the test in the evaluation of global oxidative status of a biological sample could be reassessed.

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