What is "ionized calcium"?

@article{SiggaardAndersen1983WhatI,
  title={What is "ionized calcium"?},
  author={Ole Siggaard-Andersen and J. Thode and Niels Fogh-Andersen},
  journal={Scandinavian journal of clinical and laboratory investigation. Supplementum},
  year={1983},
  volume={165},
  pages={
          11-6
        }
}
  • Ole Siggaard-Andersen, J. Thode, Niels Fogh-Andersen
  • Published in
    Scandinavian journal of…
    1983
  • Chemistry, Medicine
  • "Ionized calcium", in clinical chemistry, designates the free calcium ions which are present in the biological fluids as hydrated ions: Ca2+, 12 H2O. The calcium ion selective electrode measures differences in activity, however, values are reported not as the activity, but as the activity divided by the activity coefficient (gamma) of Ca2+ in "normal plasma". The latter is assumed to be equal to the activity coefficient (gamma) in a calibration solution of CaCl2 + NaCl with an ionic strength of… CONTINUE READING

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