Some tests are widely available and some must be done by specialized laboratories. You can ask about accuracy of the tests, as well as what steps might be taken after the results are known. You can ask about your options if you are already pregnant. You can also ask about confidentiality, such as who will have the results of your tests, and who will be informed of your testing. You can ask about the implications to your health insurance.
Genetic counselors are usually on staff in hospitals and clinics.
They are certified by the American Board of Genetic Counseling. A board certified counselor will be trained in both general genetic counseling and prenatal counseling. You can ask the counselor about qualifications and experience.