After Visa ApprovalOn this page:
All applicants must undergo a medical exam by an Embassy-approved Panel Physician. Information about the medical exam can be found here. You will receive instructions about how to schedule an appointment for your medical exam from NVC or the Embassy. Do not try to make an appointment before receiving these instructions as the validity of the medical is limited, which also limits the immigrant visa. Medical examination must be conducted by a panel physician in the country in which you apply for the visa.
U.S. Embassy Appointment
If you have an interview date, you must appear at the U.S. Embassy on the date and time of your appointment. Please read about security restrictions at the U.S. Embassy that describes what you can and cannot bring with you to your interview. You should bring your appointment letter and the documents required for your visa class.