A Comparison of Two Methods of Quality Control of pH, Pco<sub>2</sub>, and Po<sub>2</sub> Measurements

Evans, John R.

doi:10.1177/000456327801500137

Cited by 4 publications

(2 citation statements)

References 10 publications

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“…The CVs observed for [H+], PC02, and P02 are approximately double those reported in withinlaboratory trials using similar materials assayed over several weeks on one instrument (Evans, 1978;Minty and Nunn, 1977). This difference between within-laboratory precision and total betweenlaboratory, between-instrument precision is similar to that observed for many other analytes (Whitehead et al, 1973) and suggests that neither the materials used in this study nor the present state of [H +] and blood gas analysis is poor with regard to precision.…”

Section: Discussionsupporting

confidence: 67%

“…The results for the DADE and the General Diagnostics materials show similar precision; the mean value given by IL instruments for the General Diagnostics material is, however, significantly different from those for the other instrument groups. Evans (1978) also obtained significantly lower P02 values than the manufacturer's assigned value using an I L 313 instrument.…”

Section: No Of Resultsmentioning

confidence: 77%

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An Interlaboratory Survey of Hydrogen Ion and Blood Gas Determinations

et al. 1979

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A survey of [H+], Pco2, and Po2 analyses in 360 laboratories was conducted using three commercial control materials: two aqueous gas-equilibrated buffer solutions (General Diagnostics and IL) and one whole blood material (DADE). There was little difference in precision or accuracy between instruments, classified according to manufacturer into four groups, and materials for [H+] and Pco2, or in precision for Po2. There were, however, differences in accuracy between instrument groups for Po2 analysis on the aqueous materials, and in some cases the mean values lay outside the range assigned by the material manufacturers. The 35 instruments outside clinical chemistry departments yielded results similar to those of all participants. The relation between inter- and intra-laboratory precision was similar to that for many analytes, suggesting that neither these materials nor the state of these analyses is unsatisfactory. Aqueous materials should, however, be used with caution as accuracy controls for Po2.

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Section: Discussionsupporting

confidence: 67%

Section: No Of Resultsmentioning

confidence: 77%