Invasive Prenatal Procedures


Chorionic villous sampling [ CVS ]:


CVS is a surgical procedure performed after 9 weeks of gestation in which tiny pieces of the chorionic villi--the early placenta (a tissue on the outside of the fetal gestational sac) is obtained for chromosome analysis and for prenatal diagnosis of other genetic abnormalities like Thallasemia , Muscular Dystrophy etc. The procedure is done under ultrasound guidance and it does not require any anesthesia or a hospital stay. It carries 0.5% risk of abortion.


Amniocentesis


Amniocentesis is a surgical procedure in which a small amount of amniotic fluid is withdrawn from the amniotic sac - fluid surrounding the fetus. The amniotic fluid is then processed to separate the fetal cells for chromosome analysis and for prenatal diagnosis of other genetic abnormalities like Thallasemia , Muscular Dystrophy etc. Procedure is done at around 16 - 18 weeks gestation under ultrasound guidance and it does not require any anesthesia or a hospital stay. Procedure carries 0.5% risk of abortion.


Fetal Reduction


Fetal reduction is a procedure done in case of multifetal pregnancy - three or more fetuses. The procedure is done at 11 weeks of pregnancy. After cleansing the mother's abdomen with antiseptic, a long, thin needle is inserted into the mother's uterus guided by ultrasound and injection is directly given to the selected fetus which immediate tops its heart activity. Live twin fetuses are left inside. The procedure is without any pain or bleeding .


Fetal  blood sampling


Fetal blood sampling is a procedure for diagnosing, treating, and monitoring fetal problems at various times during pregnancy. A fetal blood sample may be taken to: diagnose genetic or chromosome abnormalities, to check for and treat severe fetal anemia or other blood problems such as Rh disease [ mother Rh negative and father Rh positive ] as well as to check for fetal infections and to give certain medications directly to the fetus.


There are several ways blood can be obtained from the fetus. After cleansing the mother's abdomen with antiseptic, a long, thin needle is inserted into the mother's uterus guided by ultrasound. Blood may be taken from the following sources: blood vessels of the umbilical cord (also called cordocentesis, or percutaneous umbilical blood sampling, or PUBS)  or a fetal blood vessel, usually in the liver.


Ancillary Services

  • The Fetal Medicine Unit is supported by excellent genetic services which help in faster clinical decision making.
  • Fetal blood transfusions are performed using a similar technique in cases of fetal anaemia.
  • The Pulse Fetal Medicine Unit continues to deliver medical excellence with a human touch.


 

 

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