Abstract
A method for measurement of fractional intestinal absorption of an oral dose 47Ca by whole-body counting is described. The intestinal absorption of Ca is calculated as the whole-body counting rate 6 days after the administration of radio-calcium, divided by the counting rate 6 days after a subsequent equal dose of 47Ca given intravenously, minus the extrapolated value which would then have occured if no injection had taken place. The method is based on the application of a power function model. It supplies additional information about the fractional turnover of 47Ca. The relationship between intestinal absorption and whole-body retention of Ca is outlined. Normal values for 21 adults are given.
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