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Chorionic Villus Sampling, Transcervical


Why is this procedure done?


A baby lives insides the mothers womb before it is born. The baby is linked to the mother's blood supply by a special organ called the placenta. This organ takes oxygen and nutrients from the mother's blood and moves them into the baby's blood. Sometimes, the doctors need to get a small amount of this organ for testing. This is called chorionic villus sampling or CVS. This test is most often done when a woman is between 10 and 13 weeks pregnant. Doctors often suggest CVS: ‚  
  • To screen if the baby has health problems
  • To find out if the baby inherited a disease
  • If you were pregnant before and there were problems with the baby

CVS testing can also help find out who a baby's father is by testing and comparing the genetic makeup. ‚  

What will the results be?


You and your doctor will find out if your baby has certain health problems or diseases. You may be able to find out or prove who the babys father is. ‚  

What happens before the procedure?


  • Your doctor will take your history. Talk to your doctor about:
    • All the drugs you are taking. Be sure to include all prescription and over-the-counter (OTC) drugs, and herbal supplements. Tell the doctor about any drug allergy. Bring a list of drugs you take with you.
    • Any bleeding problems. Be sure to tell your doctor if you are taking any drugs that may cause bleeding. Some of these are Coumadin ‚ ®, ibuprofen, Aleve ‚ ® (naproxen), or aspirin. Certain vitamins and herbs, such as garlic and fish oil, may also add to the risk for bleeding. You may need to stop these drugs as well. Talk to your doctor about them.
    • If you need to drink extra fluids before the procedure. Your doctor may tell you to drink three 8 ounce glasses of water 1 hour before the procedure. Try not to pass urine before the exam.
  • Your doctor will do an exam and may order:
    • Lab tests
    • Ultrasound

What happens during the procedure?


  • You will be awake during the procedure. Once in the exam room, the staff will ask you to change into a hospital gown.
  • Your doctor will tell you to lie on an exam bed with your feet in foot holders.
  • Your doctor will clean your belly using an antiseptic. A a special tool is used to open your vagina and cervix. Your doctor will put a thin flexible tube into your vagina and cervix to reach the placenta. Sometimes, an ultrasound is used to guide the tube. A small sample is taken and the tube is gently removed. More than one sample may be taken.
  • Your doctor may also repeat the procedure on the other side of your belly if you have more than one baby.
  • The procedure will take 5 to 15 minutes.

What happens after the procedure?


  • You will stay in the Recovery Room for up to 2 hours after the procedure. Your babys heartbeat will be watched. You may go home when you have fully recovered or when the doctor tells you.
  • Your doctor will send the sample to a lab for testing.

What care is needed at home?


  • Ask your doctor what you need to do when you go home. Make sure you ask questions if you do not understand what the doctor says. This way you will know what you need to do.
  • You need to rest at after the procedure. Avoid lifting heavy objects. Ask your doctor about when you may return to your normal activities like work, driving, and sex.
  • You may feel some cramping and mild contractions. Your doctor may give you drugs to help with the pain.
  • You may wash your genital area after the procedure. Use a clean cloth to dry the area afterwards.
  • You may have some vaginal bleeding after the sampling. You may use a panty liner or pad but not tampons.

What follow-up care is needed?


  • Your doctor will set an office visit to talk about the results with you. You may want to bring your partner with you to this visit.
  • Your condition needs close monitoring. Your doctor may ask you to make visits to the office to check on your progress. Be sure to keep these visits.
  • Your doctor will tell you if other tests are needed.
  • Your doctor may have you go see a genetic specialist.

What problems could happen?


  • Miscarriage
  • Infection
  • Bleeding
  • Vaginal pain
  • Belly pain

When do I need to call the doctor?


  • Very bad vaginal bleeding
  • Very bad belly pain
  • Upset stomach and throwing up
  • Fever, chills
  • Dizziness

Where can I learn more?


American Pregnancy Association ‚  
http://www.americanpregnancy.org/prenataltesting/cvs.html ‚  
National Health Service ‚  
http://www.nhs.uk/Conditions/Chorionic-Villus-sampling/Pages/How-is-it-performed.aspx ‚  

Consumer Information Use and Disclaimer


This information is not specific medical advice and does not replace information you receive from your health care provider. This is only a brief summary of general information. It does NOT include all information about conditions, illnesses, injuries, tests, procedures, treatments, therapies, discharge instructions or life-style choices that may apply to you. You must talk with your health care provider for complete information about your health and treatment options. This information should not be used to decide whether or not to accept your health care providers advice, instructions or recommendations. Only your health care provider has the knowledge and training to provide advice that is right for you. ‚  

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