GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Results from chorionic villus sampling come faster than from amniocentesis
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Chorionic villus sampling is typically performed later in the pregnancy than amniocentesis
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Ultrasound imaging has no known risk
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The complication rate for chorionic villus sampling is about 2% and for amniocentesis is 1%.
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Detailed explanation-1: -CVS is usually carried out between the 11th and 14th weeks of pregnancy, although it’s sometimes performed later than this if necessary.
Detailed explanation-2: -Typically, CVS is done at 10-12 weeks’ gestation, and amniocentesis is done at 15-18 weeks’ gestation.
Detailed explanation-3: -A major advantage of CVS is that it’s performed much earlier in pregnancy, at 10 to 13 weeks (compared with 16 to 22 weeks for amniocentesis). This allows you more decision-making time, if needed, and an earlier start to any treatment.
Detailed explanation-4: -Amniocentesis is better than CVS for some women. You should have amniocentesis if you have had a baby with a neural tube defect, such as spina bifida, or if you or your partner has a neural tube defect. CVS does not test for these problems. Amniocentesis may be better if the results of other tests have not been normal.