Concerning prenatal genetic testing, nurses should be aware that:
1. maternal serum screening can determine whether a pregnant woman is at risk of carrying a fetus with Down syndrome.
2. carrier screening tests look for gene mutations of people already showing symp-toms of a disease.
3. predispositional testing predicts with near certainty that symptoms will appear.
4. presymptomatic testing is used to predict the likelihood of breast cancer.
1
1. Correct. The test identifies risk for neural tube defects as well as specific chromosome abnormality.
2. Incorrect. Carriers of a disease such as sickle cell do not have symptoms of the disease.
3. Incorrect. Predisposition determines susceptibility as with breast cancer; presymptomatic indicates that if the gene is present, symptoms are certain to appear.
4. Incorrect. Predisposition determines susceptibility as with breast cancer; presymptomatic indicates that if the gene is present, symptoms are certain to appear.
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