This page has moved. Click here to view. The initial aspirate of 1-2 mL of fluid should be discarded to decrease the chance of maternal cell contamination. A total of 20-30 mL of fluid is aspirated, and the needle is removed.
Amniotic fluid is aspirated from the first sac.
The value of amniotic fluid alpha-fetoprotein determination with an ultrasound evaluation has become increasingly controversial as ultrasound resolution has improved. The amniotic fluid alpha-fetoprotein level may be spuriously elevated if the amniotic fluid is contaminated with fetal blood. This potential error can be eliminated, however, if amniotic fluid amniocentesis, chorionic villus sampling, amneocentesis, corionic, vilus, villos. The primary advantage of CVS is that results are available much earlier in pregnancy, which decreases parental anxiety when results are normal and, when they are abnormal, allows earlier and safer methods of pregnancy termination. Earlier diagnosis may also be required Placental villi may be obtained through transcervical, transabdominal, and transvaginal access to the placenta.