Serum immunoreactive trypsin in cystic fibrosis.

Immuno-reactive trypsin (IR-TRY) level has been measured by RIA in 185 patients with cystic fibrosis (CF) aged between 4 days and 34 years. The correlation of IR-TRY values with age and functional state of pancreas have been studied. The interpretation of the data have been put forward on the basis of possibilities of neonatal screening.