The 14C-aminopyrine breath test is a simple procedure for the non-invasive determination of the microsomal function of the liver. After the oral administration of a tracer dose of 2 microCi (74 kBq) of 14C-aminopyrine the 14CO2 activity of the expired breath air is determined in hourly intervals. There is a close correlation between its decrease and the elimination of aminopyrine from the plasma. Both the elimination constant of 14CO2 (Kbreath) and the maximal specific 14CO2 activity are useful quantitative parameters of the test. They allow conclusions as to the hepatic demethylation capacity. Both parameters were significantly lower in 15 patients with liver cirrhosis than in 12 control patients. The non-steroidal anti-inflammatory drug diclofenacsodium (Voltaren) did not significantly influence the demethylation of 14C-aminopyrine in 5 patients with rheumatic diseases and in 2 healthy probands. Further experiences with the breath test are necessary, especially with respect to its suitability for prospective investigations.
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