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Clinical Chemistry 17: 983-987, 1971;
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Clinical Chemistry, Vol 17, 983-987, Copyright © 1971 by the American Association for Clinical Chemistry

Biological and Analytic Components of Variation in Long-Term Studies of Serum Constituents in Normal Subjects

V. Estimated Biological Variations in Ionized Calcium

Eugene K. Harris 1 and David L. DeMets 1

1 Laboratory of Applied Studies, Division of Computer Research and Technology, NIH, USPHS, Bethesda, Md. 20014.

Intra- and interindividual components of variation in ionized calcium among normal individuals have been estimated. The basic data were means of duplicate analyses of total serum calcium, total serum protein, and serum albumin from 68 normal subjects, 10-12 weekly samples per person. The McLean-Hastings equation was used to estimate [Ca2+]. Use of observed albumin/globulin ratios, instead of an assumed constant, had negligible effect on mean [Ca2+] or components of variation. The interindividual component of variation in [Ca2+] was found to be the same as that in total calcium: 3%. Average intraindividual variation (0.045-0.05 mmol/liter), appeared to be entirely attributable to analytical deviations in total protein and total calcium determinations. Thus, in the average normal individual, no physiologic variation in [Ca2+] could be detected. Results agreed with recent data on [Ca2+] measured by calcium ion-selective electrodes.


Key Words: variance • inter- and intraindividual variation • homeostasis • A/G ratio • total serum calcium • hormonic control • ion-selective electrodes

Submitted on April 6, 1971
Accepted on July 8, 1971






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Copyright © 1971 by the American Association for Clinical Chemistry.