Measurement of47calcium retention with a whole-body counter

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Abstract
A method for measuring the retention of orally administered47Ca using a whole-body counter (WBC) is described. One microcurie47Ca in 90 ml of lowfal milk was given along with 5 μCi51Cr as a stool marker. The retention of47Ca was determined at 7 days if less than 2% of the administered51Cr was present in the body. Correlation between calcium retention by the whole-bodycounting and the excreta-recovery methods was highly significant (r=0.835,P47Ca retention has the advantages over other techniques that no collections of blood or stool are needed, no residency on a metabolic ward is required, and the radiation exposure (13 mrem) is so low that multiple studies may be performed in the same subject.