Antenatal Screening
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Ultrasound Scanning |
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Amniocentesis |
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Alpha feto protein Test (AFP) |
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Chorionic Villus Sampling |
Chorionic Villus Sampling (CVS)
This is a relatively new procedure, that is not yet available in all
areas. CVS is carried out in the early weeks of pregnancy, in those
who are thought to be at risk of giving birth to a child that
suffers from a genetic or chromosomal abnormality. The procedure is
very similar to an amniocentesis, although CVS involves sampling
placental cells, rather than amniotic fluid, and can be done either
through inserting a plastic tube into the uterus through the cervix,
or via the abdomen. Using ultrasound as a guide, the doctor will
carefully insert the needle taking great care not to rupture the
amniotic membrane or cause any harm to the developing foetus. The
procedure is fairly quick, lasting only about five minutes, and has
been reported to be fairly painless.
The results of the test will be available from 7-10 days, although
in some cases you may only have access to these after a month.
Either way, it does offer the parents relief or insight, sooner than
an amniocentesis would, and if termination is preferred from the
results, it can be done at a much earlier stage, lessening the grief
for both parents.
How safe is CVS?
As with any medical procedure, there are certain risks that have to
be considered, although the end decision does remain with you and
your partner.
- There is a slight risk of infection to the baby
- Miscarriage is more likely than that for amniocentesis, because CVS is done earlier in the pregnancy
- The amniotic sac may be accidentally punctured
- Rare cases of limb deformities have been reported, especially when CVS was carried out before 10 weeks
