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Scandinavian Journal of Clinical and Laboratory Investigation Volume 45, 1985 - Issue 3
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Original Article

Measurement of ionized calcium with five types of instruments. An external quality assessment

A. Uldall Department of Clinical Chemistry, University of Copenhagen, Herlev Hospital, Denmark
,
N. Fogh-Andersen Department of Clinical Chemistry, University of Copenhagen, Herlev Hospital, Denmark
,
J. Thode Department of Clinical Chemistry, University of Copenhagen, Herlev Hospital, Denmark
,
A. B. T. J. Boink Laboratory Clinics of Cardiac Surgery and Cardiology, State University Hospital, Utrecht, The Netherlands
,
J. Kofstad Institute of Clinical Biochemistry, Rikshospital, University of Oslo, Linköping, Sweden
,
L. Larsson Department of Clinical Chemistry, University Hospital, Linköping, Sweden
,
S. Narvanen Laboratory of Children's Hospital, Helsinki, Finland
,
K. O. Pedersen Department of Clinical Chemistry, Aalborg Hospital, Denmark
&
T. Weber ClinicaI Laboratory, Aurora Hospital, Helsinki, Finland
 show all
Pages 255-261 | Received 25 Jun 1984, Accepted 29 Oct 1984, Published online: 08 Jul 2009

References

  • Burrit M F, Pierides A M, Offord K P. Comparative studies of total and ionized calcium values in normal subjects and patients with renal disorders. Mayo Clin Proc 1980; 55: 606–13
  • Robertson W G, Marshall R W. Ionized calcium in body fluids. CRC Crit Rev Clin Lab Sci 1981; 15: 85–125
  • Thode J, Wandrup J, Aas F, Siggaard-Andersen O. Evaluation of a new semiautomatic electrode system for simultaneous measurements of ionized calcium and pH. Scand J Clin Lab Invest 1982; 42: 407–15
  • Larsson L, Öhman S. Serum calcium ion activity. Some aspects or methodological differences and intraindividual variation. Clin Biochem 1979; 12: 138–41
  • Brauman J, Delvigne C H, Deconnick I, Willems D. Factors affecting the determination of ionized calcium in blood. Scand J Clin Lab Invest 1983; 43: 27–31, suppl. 165
  • Thode J, Fogh-Andersen N, Aas F, Siggaard-Andersen O. Sampling and storage of blood for determination of ionized calcium. Scand J Clin Lab Invest 1985, (in press)
  • Uldall A, Fogh-Andersen N, Thode J, (1984) Quality assessment of the determination of ionized calcium with ion selective electrodes. Ionized calcium, sodium and potassium by ion selective electrodes, IFCC Workshop. 1983, A HJ Maas, J Kofstad, O Siggaard-Andersen, G Kokholm, et al. Private press, Oslo, 165–72
  • Uldall A. Preparation of frozen reference sera and examples of application. Scand J Clin Lab Invest 1984; 44: 223–9
  • Nielsen T T. A method for enzymatic determination of citrate in serum and urine. Scand J Clin Lab Invest 1976; 36: 513–19
  • Fogh-Andersen N. Ionized calcium analyzer with a built-in pH correction. Clin Chem 1981; 27: 1264–7
  • Uldall A, Fogh-Andersen N, Boink A BTJ, et al. An external quality assessment scheme for measurement of Ca2+ using ion selective electrodes. Nordkem posters 1984. Helsinki, Nordkem 1984, in press
  • Vadgama P, Mitchinson J, Covington A K, Alberti K GMM. Interferent ion effects on the Orion SS-20 calcium ion analyzer. Clin Chim Acta 1982; 119: 249–56
  • Boink A BTJ, Maas A HJ (1984) Computor simulation of calcium ion selective electrode measurements. Ionized calcium, sodium and potassium by ion selective electrodes. IFCC Workshop. 1983, A HJ Maas, J Kofstad, O Siggaard-Andersen, G Kokholm. Private press, Oslo, 123–38
  • Covington A K, Boink A BTJ, Maas A HJ (1984) Standard reference solutions for blood electrolyte determination. Ionized calcium, sodium and potassium by ion selective electrodes. IFCC Workshop. 1983, A HJ Maas, J Kofstad, O Siggaard-Andersen, G Kokholm. Private press, Oslo, 229–38

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