1992
DOI: 10.1093/clinchem/38.8.1459
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Frozen Human Serum Reference Material for Standardization of Sodium and Potassium Measurements in Serum or Plasma by Ion-Selective Electrode Analyzers

Abstract: Three interlaboratory round-robin studies (RR1, RR2, and RR3) were conducted to identify a serum-based reference material that would aid in the standardization of direct ion-selective electrode (ISE) measurements of sodium and potassium. Ultrafiltered frozen serum reference materials requiring no reconstitution reduced between-laboratory variability (the largest source of imprecision) more than did other reference materials. ISE values for RR3 were normalized by the use of two points at the extremes of the cli… Show more

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Cited by 18 publications
(13 citation statements)
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“…The observed bias may be corrected for by recalibration with materials having values assigned by flame photometry (1). For such a procedure to be effective, however, the materials must show an interassay behaviour similar to that of patient sera, i. e. they have to be commutable.…”
Section: Discussionmentioning
confidence: 99%
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“…The observed bias may be corrected for by recalibration with materials having values assigned by flame photometry (1). For such a procedure to be effective, however, the materials must show an interassay behaviour similar to that of patient sera, i. e. they have to be commutable.…”
Section: Discussionmentioning
confidence: 99%
“…Methods based on "indirect" potentiometry (diluted sample), with ion-selective electrodes, are widely used for the clinical measurement of sodium and potassium in serum. Alternative analytical approaches include "direct" potentiometry (undiluted sample), also widely used (1), and enzyme activation-based photometric methods (2,3). Flame atomic emission photometry is mainly used for reference purposes (4).…”
Section: Introductionmentioning
confidence: 99%
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“…7,8 To meet such a requirement, National Metrology Institutes (NMIs) worldwide have developed certified reference materials (CRMs) for the analysis of various analytes of clinical importance. [9][10][11][12][13][14] In the case of clinical samples, such as serum and plasma, often composed of almost identical matrices due to homeostatic regulatory mechanisms operational in physiological processes, matrix-matched CRMs can be made available and provide an efficient means for quality control and method validation in clinical analysis.…”
Section: Introductionmentioning
confidence: 99%