The calibration procedure for the measurement of total body potassium with a high sensitivity shadow-shield whole-body counter is described. The sources of error have been analysed and it is shown that the estimated standard error for the procedure is 2.7% for a subject with 140 g of potassium, when 42K is administered to the subject as an internal standard. When a calibration factor is obtained from a 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 subject a change of body potassium equal to 4.6% would be significant.
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Boddy et al. (1971) studied this question.
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