Also known as fetal blood sampling or Percutaneous Umbilical Cord Blood Sampling (PUBS), cordocentesis is a diagnostic test mainly used to examine the blood of the fetus for detecting fetal abnormalities.
This prenatal testing is used to diagnose in utero complications along with Down syndrome and heart defects.
Advanced imaging ultrasound is used to find the area where the baby’s umbilical cord joins the placenta.
The only difference between this test procedure and amniocentesis test is that blood is retrieved from the fetus.
Usually, the test is done when the required information is inconclusive or cannot be obtained from amniocentesis, ultrasound or CVs.
Usually, the right time to undergo this test is when you are just above 17 weeks pregnant, i.e. after the complete development of the umbilical cord.
The test is used to detect chromosomal abnormalities such as Down syndrome and other blood disorders like fetal hemolytic disease. It also helps diagnose the following abnormalities:
Cordocentesis differs from amniocentesis, in that testing is not allowed to detect neural tube defects in the latter. The procedure is also successful in treating parvovirus in a twin pregnancy.
Though this procedure is considered as safe, it is identified as an invasive diagnostic test that does cause potential risks. There is 1 to 2% risk for miscarriage signs with a small risk of infection.
There is no need for anesthesia as it can cause slight discomfort, cramps and contractions, both during the test and for some days after the procedure.
Some other potential side effects of cordocentesis include:
You should immediately contact your practitioner if any of the above-mentioned symptoms remain or become worse. Also, contact your healthcare provider if you notice:
After undergoing the procedure, you will be told to take complete rest for 24 hours.
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