Final answer:
Genetic studies in OB should be offered to women over 35 years old, women with a family history of genetic disorders, and women who have a history of infertility. These groups have a higher risk of having a child with a genetic or chromosomal disorder.
Step-by-step explanation:
Genetic studies in OB should be offered to women over 35 years old, women with a family history of genetic disorders, and women who have a history of infertility. These groups have a higher risk of having a child with a genetic or chromosomal disorder, so it is important to offer genetic counseling and testing to assess the likelihood of their child being affected. For example, women over 35 are at a higher risk of having a child with Down syndrome.