Procedure, part 1
Guided by ultrasound, your doctor pinpoints the spot where the umbilical cord meets the placenta. He then inserts a needle through your abdomen and uterus and into the umbilical cord and withdraws a small amount of fetal blood.
Update Date 2/24/2007
Updated by: Douglas A. Levine, MD, Gynecology Service, Memorial Sloan-Kettering Cancer Center, New York, NY. Review provided by VeriMed Healthcare Network.