The relation between placental leucine aminopeptidase (PLAP) activity in maternal
sera and umbilical artery waveforms (systolic/diastoic ratio, S/D) obtained by pulsed
Doppler has been examined by cross-sectional study in 26 normal pregnancies during
weeks 26 - 38. A negative correlation was seen to exist suggesting that P-LAP may
have a role in the regulation of uteroplacental blood flow.
Placental Leucine Aminopeptidase (P-LAP) - Systolic/Diastolic Ratio (S/D Ratio) -
Uteroplacental Blood Flow - Vasopressin