We assessed the magnitude of the errors in ionized-calcium measurements resulting from
changes in electrolyte composition for three different ion-selective electrodes: the Orion …

We examined the performance characteristics of an improved electrode for measurement of
ionized calcium (Orion Research, Inc.) with respect to interferences by Na+, K+, Li+, Mg2+ …

To determine if bias between different ionized calcium analyzers could be decreased, we
analyzed 10 control fluids during a study in which ionized calcium was measured in more …

A simple procedure is described for the preparation of a stable precision quality control
material for use in the measurement of levels of ionised calcium in serum at or near the …

Interference with the function of the Orion serum calcium-specific ion electrode was found to
result from the presence of 10− 4 to 10− 2 mole/l of a variety of organic bases and other …

Since 1976 we have used the Orion SS-20 for routine determination of serum ionized
calcium. Our reference range was 0.96-1.16 mmol/liter, based on serum samples from 110 …

Ionized calcium in serum has been determined potentiometrically by using a calcium ion-
selective electrode in a flow-through configuration. For 397 normal human adults the mean …

Ion-exchange calcium electrodes represent the first practical method for the direct
measurement of ionized calcium [Ca++] in biologic fluids. Using both “static” and “flow …

This article reviews key advances in ion-selective electrode technology that have made
potentiometric measurements of ionized calcium (Ca2+) reliable and precise. Our use of two …

Using different substance concentrations in an aqueous 1.25 mmol/L solution of CaCl2 plus
NaCl to a final solution ionic strength of 160 mmol/L, we tested six buffers for their effect on …