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Factitiously high sodium activities on the Ektachem 400 owing to interferences by high gamma-globulin concentrations
S J Eastep1, P J Benson, L M Preese
1Clinical Laboratories #812, Hennepin County Medical Center, Minneapolis, MN 55415.
Abstract:
Sera from patients with above-normal gamma-globulin concentrations give sodium values as much as 10% higher when measured in the Kodak Ektachem 400 analyzer than results obtained with the Beckman Astra-8 analyzer. Results obtained with the Astra were in agreement with flame photometry. A similar relative bias was observed for potassium measurement in the Ektachem. This discrepancy was corrected when we used a new generation of reference fluid provided by Kodak, which is currently available for general use.
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