[Indicators of the identity of aspirates from the oral cavity of newborn infants and the amniotic fluid: pH, protein levels and the activity of trypsin inhibitor].

: The aim of the study was to establish the biochemical identity as regards pH, protein content and trypsin inhibitor activity between the aspirate from the various sites of the newborn oral cavity and the amniotic fluid. It has been found that only correctly collected aspirate from the oral cavity without any admixture of the subepiglottic or gastric content is identical with amniotic fluid. Measurement of trypsin inhibitor activity in the improperly collected aspirate with pH below 5 must not be performed. The examination of the correctly sampled aspirates from the newborn oral cavity could be a source of the new early information regarding survival and the clinical condition of the newborn.