Origin and levels of trypsin in amniotic fluid throughout pregnancy

Abstract
Trypsin is present in midtrimester [human] amniotic fluid with a mean level of 350 .+-. 260 ng/ml but has virtually disappeared by term. The trypsin originates in fetal pancreas and enter the gestation sac apparently by passage of meconium, which ceases as a physiological event by 16-18 wk. This finding could form the basis of an antenatal test for the presence of cystic fibrosis in the fetus.

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