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Clinical Chemistry 13: 151-159, 1967;
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Clinical Chemistry, Vol 13, 151-159, Copyright © 1967 by the American Association for Clinical Chemistry

Calcium Determinations in Kinetic Studies

I. A New Method for Low Urinary Calcium Concentrations

A. J. W. Hitchman 1, Joan E. Harrison 1, and J. M. Finlay 1

1 Department of Medicine, University of Toronto, Toronto 5, Ontario, and Gastroenterology Laboratory, Toronto General Hospital, 101 College Street, Toronto 2, Ontario, Canada.

A new procedure for the determination of urinary calcium concentrations as low as 1 mg./L. is presented. Calcium is separated from interfering urinary constituents by oxalate precipitation with strontium carrier and then determined by emission flame photometry. Small calcium losses in the separation procedure are estimated by 47Ca-tracer technics. Wet-ashing ensures complete exchange of tracer and sample calcium. Experimental evidence demonstrated the accuracy of the procedure and a precision of ± 3% of the observed results. The use of tracer may be omitted if systematic errors up to 5% are acceptable. Wet-ashing has also been omitted with equally good results but there is an additional risk of error due to possible interference effects by constituents of some pathological samples.

Submitted on August 10, 1960
Accepted on October 14, 1966






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Copyright © 1967 by the American Association for Clinical Chemistry.