When is the earliest that chorionic villus sampling can be performed during pregnancy?
a. 4 weeks
b. 8 weeks
c. 10 weeks
d. 12 weeks
ANS: C
Fetal villus tissue can be obtained as early as 10 weeks of gestation and can be analyzed directly for chromosomal or genetic abnormalities. It is too early to be performed at 4 weeks. It is too early to be performed at 8 weeks. The test should be performed at 12 weeks, but it can be done as early as 10 weeks.
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