Amniotic fluid endothelin-1 (ET-1) levels were measured in 38 euploid
and in 15 aneuploid pregnancies in the 17th gestational week. Varying
distribution of the peptide levels was Endothelin found in the two gro
ups, with higher values in the pathological Aneuploidy cases. Should t
his finding be confirmed in maternal blood, ET-1 could represent a fur
ther analyte to be used in prenatal screening for aneuploidy.