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Technology
The chorionic villi biopsy usually
takes place between the 10th and 12th week of pregnancy.
Prior to that the development of the embryonic organs is not complete.
Cells of the placenta are extracted via a thin needle
through the abdominal wall (or rarely by means of a catheter through the cervical
canal) under constant ultrasonic observation.
This
ambulatory operation which is
only slightly painful takes place in a special prenatal
clinic and takes only a few minutes.
Results
A preliminary result showing the number
of chromosomes is available after 1 to 2 days.
This short term
analysis is then confirmed via a check-up.
Advantages
In comparison to amniocentesis
CVS can thus show substantially earlier if there are any chromosomal
abnormalities.
Useful Links:
LMU München - http://www.pedgen.med.university Munich.de/medgen/patinfo/patinfo_f.html
http://www.nlm.nih.gov/medlineplus/ency/article/003406.htm
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