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  • Title: Near-patient potassium and sodium measurements: evaluation of ion-selective electrodes (Ionometer EF2) in a dialysis department.
    Author: Madsen HH, Antonsen S, Nielsen HK.
    Journal: Blood Purif; 1990; 8(3):171-6. PubMed ID: 2244994.
    Abstract:
    For potassium and sodium monitoring, an Ionometer EF2 was installed in our dialysis unit. The apparatus measured linearly, and between-series and within-series variations were comparable to flame photometry. No difference in performance was disclosed when operated by one or several persons. The 95% limits of agreement between Ionometer EF2 and flame photometry were for potassium -0.29 and 0.43 mmol/l and for sodium -5.0 and 2.89 mmol/l, respectively. Contrary to sodium, the accidental difference for potassium was greater than expected from analytical variation.
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