the percentage 14c excreted in breath 14co2 in 2 hr ( aminopyrine breath test , abt ) correlated with the breath 14co2 elimination rate ( r = 0.92 , p less than 0.01 ) , with the aminopyrine metabolic clearance rate ( mcr ) ( r = 0.85 , p less than 0.01 ) , and with the plasma half-life of 4-aminoantipyrine ( r = -0.54 , p less than 0.05 ) .
C0002586
aminopyrine
C0002696
aminoantipyrine