Robertson, Audra (September 19, 2006). "Medical Encyclopedia: Chorionic Villus Sampling." Medline Plus. Retrieved February 15, 2008, from http://www.nlm.nih.gov/medlineplus/ency/article/003406.htm
I found this article to be very informative on the procedure of chorionic villus sampling. Depending on where the placenta is located, CVS may be performed either transcervical (through the cervix) or transabdominal (through the abdomen). Both of these techniques are aided by ultrasound guidance. Doctors suggest the patient drink fluids the morning of the procedure and abstain from urinating. Having a full bladder allows for a more sufficient visualization from which a sample is taken.
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