Design and preliminary performance characteristics of a newly proposed reference cell for ionized calcium in serum.

Abstract:

:A novel flow-through design for a calcium ion-selective liquid membrane and half-cell is proposed. The membrane is based on a neutral carrier for calcium and has the same quantitative chemical composition as that used in most commercial analyzers for ionized calcium (iCa2+). The membrane and half-cell follow the specifications in the Stage 1, Draft 4 document for a Reference Method for iCa2+ of the IFCC Expert Panel on pH, Blood Gases, and Electrolytes. Measurements of iCa2+ in serum with this cell confirm prior observations that protein adsorption on the membrane surface causes a rapid but reversible shift in the cell calibration signal and possible systematic errors in the measurement of iCa2+ in serum. When the protein adsorption phenomenon is maintained at equilibrium during calibrations and sample measurements, the new cell can be used to reproducibly assign iCa2+ concentrations to serum pools. These calibrated pools may then be used as reference materials and to resolve the biases known to exist among commercial iCa2+ analyzers.

journal_name

Clin Chem

journal_title

Clinical chemistry

authors

D'Orazio P,Bowers GN Jr

subject

Has Abstract

pub_date

1992-07-01 00:00:00

pages

1332-9

issue

7

eissn

0009-9147

issn

1530-8561

journal_volume

38

pub_type

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