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Intra-individual Variation of Some Serum Constituents and Its Relevance to Population-based Reference Ranges. by J F Pickup; E K Harris; M Kearns; S S Brown is a Medicine article available to read on EtoBox.

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## Abstract The advent of high-capacity multi-channel analyzers allows estimation of long-term variability in serum constituents of large numbers of subjects. By frozen storage of specimens with subsequent analysis in a single machine run, long-term analytical variation may be eliminated, thus sharpening the estimates of intra-individual variation. In the present study we used the Vickers M-300 analyzer to obtain the data for such estimates from 37 male volunteers, each bled once a week for 22 weeks. Secimens were analyzed in random order to eliminate any biasing effect of analytical drift during the 4-h machine run. Ten serum constituents were measured. Storage-induced linear trends were small or negligible during the period of specimen collection. Using the ratio of average within-subject variance to the variance among subjects as a guide, serum alkaline phosphatase was found to show the greatest individuality, sodium and potassium the least. Other constitutents showed varying degrees of individuality, but for all these analytes, the usual population-based reference ranges were found to be either insensitive or irrelevant to the study of concentration changes over time within mos

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Author

J F Pickup; E K Harris; M Kearns; S S Brown

Publisher

American Association for Clinical Chemistry; American Association for Clinical Chemistry, Inc.; Oxford University Press (OUP); American Association for Clinical Chemistry (AACC); Test accounts (ISSN 0009-9147)

Published

1977

Language

EN

Field

Medicine (Health Sciences)