Further Studies on Renal Tubular Conservation of Free Amino Acids in Early Infancy

Abstract
The plasma levels and urinary excretion rates of 32 amino acids and related compounds were measured in 4 fasting premature infants and 3 full-term infants. Values for renal clearance and renal tubular reabsorption were calculated for 21 of these and compared with the figures for 3 adults. The main patterns of renal tubular conservation of amino acids were discussed in relation to pre-renal factors, to known common reabsorp-tive pathways and to structural relations.