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Measuring the nutritional status of trace elements in plasma is invalidated in the presence of a systemic inflammatory response. We examined the potential of erythrocytes to assess copper, zinc and selenium status in such situations.Venous blood samples were withdrawn pre-operatively and at 12, 24, 48, 72 and 168h post-operatively from 11 patients (6 males and 5 females) who were admitted for elective...