Question 16

Chorionic villus sampling is the recommended test for early genetic disorder screening.

Chorionic villus sampling (CVS) is typically performed between 10 to 13 weeks of pregnancy, making it the earliest option available for testing the fetus for genetic disorders. This procedure allows for the collection of placental tissue to analyze fetal chromosomes and detect potential abnormalities.

A) Chorionic villus sampling

Chorionic villus sampling is the most suitable option for Tracy as it can be conducted at 10 weeks of pregnancy, allowing for early detection of genetic disorders. It provides results faster than other options, helping in making timely decisions about the pregnancy.

B) Amniocentesis

Amniocentesis is performed later in pregnancy, usually between 15 to 20 weeks. While it is effective for genetic testing, it is not suitable for Tracy's request for early testing, making it an incorrect choice in this context.

C) Ultrasound

Ultrasound is primarily used for imaging and assessing fetal development rather than for genetic testing. While it can identify some physical anomalies, it does not provide the genetic information that Tracy is seeking, thus it is not the correct option.

D) Bayley Scales

The Bayley Scales are developmental assessment tools used for evaluating infant development after birth, not for prenatal genetic testing. This option is irrelevant to Tracy’s needs and therefore incorrect.

E) Apgar test

The Apgar test is administered immediately after birth to assess the newborn's health and is not applicable for prenatal testing. This option does not meet Tracy’s requirement for early genetic testing, making it an incorrect choice.

Conclusion

Chorionic villus sampling is the only option that meets the criteria for early genetic testing at 10 weeks of gestation, making it the definitive choice for Tracy. Other options either do not provide genetic information or are not performed at an early enough stage in the pregnancy, failing to address her specific needs.