An advantage that chorionic villus sampling has over amniocentesis as a method of prenatal testing for genetic disorders is that

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Chorionic villus sampling can be done earlier in the pregnancy (usually between 10-13 weeks) than amniocentesis (usually between 15-20 weeks), so parents can get the test results sooner. This can help alleviate any anxiety or uncertainty about the health of the fetus earlier in the pregnancy.

An Advantage That Chorionic Villus Sampling Has Over Amniocentesis as a Method