title: PABA screening test for exocrine pancreatic function in infants and children.
abstract: P-Amino-benzoic acid (PABA) is split specifically by pancreatic chymotrypsin from the synthetic tripeptide N-benzoyl-L-tyrosyl-PABA. The urinary excretion of absorbed PABA serves as an index for exocrine pancreatic function. The peptide (0.015 g/kg) was administered orally to 20 controls (aged between 5 months and 16 years), 6 patients with exocrine pancreatic insufficiency caused by cystic fibrosis (CF), and 9 newborn infants. In the controls the mean 6-hour PABA recovery was 58.5% (+/- 11.2 SD). Recovery in patients with CF was lower (P less than 0.001) with no overlap. In newborn infants the mean 6-hour PABA recovery was 23.4 (+/- 17.7 SD); overlapping in 3 instances with the results in CF patients. This simple, noninvasive test thus appears promising and merits further investigation in younger infants, especially newborns.
mesh_terms: D010129:4-Aminobenzoic Acid / Q000652:urine; D000293:Adolescent; D062365:Aminobenzoates; D002648:Child; D002675:Child, Preschool; D002918:Chymotrypsin / Q000378:metabolism; D003550:Cystic Fibrosis / Q000150:complications; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D010179:Pancreas / Q000502:physiology* / Q000503:physiopathology; D010182:Pancreatic Diseases / Q000175:diagnosis* / Q000209:etiology / Q000652:urine
chemical_list: D062365:Aminobenzoates; D002918:Chymotrypsin; D010129:4-Aminobenzoic Acid