Compared with amniocentesis, chorionic villus sampling:
a. Has a lower risk of abortion
b. Can be done earlier in pregnancy
c. Is noninvasive and less painful
d. Reveals alpha-fetoprotein level
ANS: B
Chorionic villus sampling can be done earlier than amniocentesis. It carries a higher (not lower) risk of abortion. Amniocentesis allows the measurement of alpha-fetoprotein, whereas chorionic villus sampling does not. Both procedures are invasive.
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