Amy and Keith, both in their mid-twenties, have decided to have a baby. Both are in good health and are physically active, although Keith is a smoker. Amy maintains her weight at about 125 pounds. While they know that parenting is a big responsibility, they are excited about the idea of becoming parents. The one thing that they are concerned about is the history of genetic illnesses that exists in each of their families. After 6 months of not being successful in conceiving, Amy also becomes concerned that she may be infertile. She wants to see a fertility specialist.Because of Amy's and Keith's concerns about genetic illnesses, their doctor will likely encourage them to have diagnostic screening tests. Which one would be the earliest test to indicate a genetic abnormality?
A. amniocentesis
B. a quadruple marker screening
C. a sonogram
D. chorionic villi sampling
Answer: D
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