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Plasma creatinine medians from patients partitioned by gender and age used as a tool for assessment of analytical stability at different concentrations

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

DOI

  1. Gender-partitioned patient medians of serum albumin requested by general practitioners for the assessment of analytical stability

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

  2. Verification study on the NORIP LDH reference intervals with a proposed new upper reference limit

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

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Background Monthly medians of patient results are useful in assessment of analytical quality in medical laboratories. Separate medians by gender makes it possible to generate two independent estimates of contemporaneous errors. However, for plasma creatinine, reference intervals (RIs) are different by gender and also higher over 70 years of age. Methods Daily, weekly and monthly patient medians were calculated from the raw data of plasma creatinine concentrations for males between 18 and 70 years, males >70 years, females between 18 and 70 years and females >70 years. Results The medians of the four groups were all closely associated, with similar patterns. The mean of percentage bias from each group defined the best estimate of bias. The maximum half-range (%) of the bias evaluations provided an estimate of the uncertainty comparable to the analytical performance specifications: thus, bias estimates could be classified as optimum, desirable or minimum quality. Conclusions Medians by gender and age are useful in assessment of analytical stability for plasma creatinine concentration ranging from 60 to 90 μmol/L. The daily medians are valuable in rapid detection of large systematic errors, the weekly medians in detecting minor systematic errors and monthly medians in assessment of long-term analytical stability.

OriginalsprogEngelsk
TidsskriftClinical Chemistry and Laboratory Medicine
Vol/bind58
Udgave nummer1
Sider (fra-til)69-76
ISSN1434-6621
DOI
StatusUdgivet - 18 dec. 2019

ID: 57710858