1. A method is proposed for the determination of the rate of oxidation of 14C-labelled substrates in man from blood sampling only.

2. The method was verified by simulating release of 14C into the bicarbonate pool of patients by using a constant-rate infusion of sodium [14C]bicarbonate, the plasma level of total 14CO2 (d.p.m. ml−1 70 kg−1) correlating well (r = 0.878, P = 0.001) with the infusion rate (μCi/h).

3. Techniques involved in employing this method are discussed, particularly in the light of errors involved.

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