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  • Title: Acute inflammatory response does not affect erythrocyte concentrations of copper, zinc and selenium.
    Author: Oakes EJ, Lyon TD, Duncan A, Gray A, Talwar D, O'Reilly DS.
    Journal: Clin Nutr; 2008 Feb; 27(1):115-20. PubMed ID: 18037540.
    Abstract:
    BACKGROUND & AIMS: 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. METHODS: Venous blood samples were withdrawn pre-operatively and at 12, 24, 48, 72 and 168 h post-operatively from 11 patients (6 males and 5 females) who were admitted for elective knee arthroplasty. C-reactive protein, albumin, copper, zinc, selenium and iron were measured in plasma and erythrocytes. RESULTS: Plasma zinc and selenium concentrations fell significantly: 95% confidence intervals (CI)=-32% to -44% and -22% to -36%, respectively. Copper concentrations fell transiently and then increased significantly: CI=12-43%. No significant changes were seen in trace element concentrations in erythrocytes expressed either as a ratio of haemoglobin or iron concentration. Erythrocyte iron levels correlated significantly with haemoglobin (r=0.93). CONCLUSIONS: Plasma concentrations of copper, zinc and selenium are unreliable markers of status in patients with an acute inflammatory response. Erythrocyte concentrations of these trace elements may provide a more reliable measure in long-term studies of patients with a chronic systemic inflammatory response. Iron can be used instead of haemoglobin as the denominator when expressing erythrocyte concentrations of trace elements.
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