Abstract
The calibration procedure for the measurement of total body potassiumwith a high sensitivity shadow-shield whole-body counter is described. The sourcesof error have been analysed and it is shown that the estimated standard error for theprocedure is 2.7% for a subject with 140 g of potassium, when 42K is administeredto the subject as an internal standard. When a calibration factor is obtained froma derived regression equation relating this factor to the subject's weight and height,the estimated standard error is 3.9%. In sequential measurements in the same subjecta change of body potassium equal to 4.6% would be significant.
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