chorionic villus


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chorionic villus

n.
Any of the minute fingerlike projections of the fetal chorion that contain fetal blood vessels and that combine with maternal uterine tissue to form the placenta.
References in periodicals archive ?
The only definitive test involves chorionic villus sampling and amniocentesis but that carries a risk of miscarriage.
Existing invasive diagnostic tests -- Chorionic villus sampling (CVS) and amniocentesis, which use samples from the developing placenta, are still only 75-90 per cent accurate with a risk of miscarriage," he said.
It then covers complications such as recurrent spontaneous abortion, preeclampsia and eclampsia, postpartum hemorrhage, emergency care, blood group alloimmunizations, multiple gestations, prevention and management of preterm birth, placental disorders, prolonged pregnancy, cesarean and breech delivery, analgesia and anesthesia, and neonatal encephalopathy and cerebral palsy, ending with amniocentesis and chorionic villus sampling procedures and fetal surgery.
It is often stated that more fetuses are lost due to such invasive procedures (amniocentesis and chorionic villus sampling) than are identified as carrying a chromosomal abnormality.
Despite the decrease in HIV transmission with antiretroviral cover, procedures such as chorionic villus sampling and cordocentesis should still be avoided in the HIV-infected woman as the risk of transmission to the fetus may be considerably higher.
(4) The Royal College of Obstetricians and Gynaecologists guideline on amniocentesis and chorionic villus sampling advises that patients should be informed of an additional 1% risk of fetal loss following an amniocentesis, and a slightly higher risk following chorionic villus sampling.
All of these pregnant women are then offered the option of further, invasive tests including amniocentesis or chorionic villus sampling, which have about a 1% risk of miscarriage.