St Vincent's Clinic Medical Imaging & Nuclear Medicine
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Chorionic Villus Sampling (CVS)

What you need to do to prepare for a CVS

  • You must have a referral
  • It is important we know your blood group prior to your test. This should be written on your antenatal card or available from your referring doctor.  Written confirmation of your blood test is required.  If you do not have your blood group please arrange with your referring doctor to have a blood test prior to your appointment and bring the results with you.
  • If you have rhesus negative blood you will require an injection of Anti-D which we will provide
  • A semi full bladder is required for the test
  • Empty your bladder 1 hour prior to your appointment time
  • Drink 2 to 3 glasses of water after emptying your bladder
  • Finish drinking your water at least 30 minutes prior to your appointment
  • Do not empty your bladder whilst or after you finish drinking your water. If you are uncomfortable advise our staff upon arrival

What will happen when you have your examination

  • You may experience some discomfort during the procedure.  Please advise the specialist of any pain during this time
  •  We recommend that you are accompanied home
  • You should not return to work the day of your examination
  • You should rest or undertake light activity for the rest of the day and avoid strenuous exercise for 2 days after the procedure
  • It is normal to experience some discomfort similar to a mild period pain or cramp following CVS. This could persist for 2-3 days
  • Please call your doctor if you experience any heavy bleeding, severe pains or signs of infection e.g. a high temperature. After hours, contact your referring doctor or an accident and emergency department and explain the procedure you have had done

Our obstetric and gynaecology imaging specialist may discuss your results with you at the time of your examination.

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