The nurse is providing care to a pregnant client who will undergo chorionic villi sampling. The client is currently 8 weeks pregnant

When teaching the client about this genetic testing, which layer of the embryonic membrane is tested during this procedure?
A) Chorion
B) Amnion
C) Ectoderm
D) Endometrium


Answer: A

The chorion is the outermost embryonic membrane and develops into chorionic villi, which can be used for early genetic testing of the embryo at 8 to 11 weeks' gestation by chorionic villi sampling. The endometrium is the lining of the uterus and will not be used for genetic testing of the embryo. The ectoderm is a germ layer and will develop into specific structures within the developing fetus. The amnion will develop into amniotic fluid, which can also be sampled for genetic testing but may not be developed by 8 weeks' gestation.

Nursing

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