All individuals seeking to immigrate to the U.S. must complete a medical examination. The medical examination is utilized by the relevant U.S. government agency to confirm that an applicant is not inadmissible to the U.S. pursuant to public health grounds.
If you are filing an Adjustment of Status application with the USCIS, the medical examination must be completed by a designated Civil Surgeon.
If you are pursuing your immigrant visa through a U.S. Embassy or U.S. Consulate abroad, the medical examination must be completed by a Panel Physician. The following websites provide further information on this topic: http://travel.state.gov/visa/immigrants/info/info_3739.html and http://travel.state.gov/visa/immigrants/info/info_3745.html
It is strongly recommended that an applicant bring proof of their vaccination history to their medical examination appointment. Otherwise, the physician may need to administer any vaccinations that cannot be verified. If a vaccine is not age appropriate or an applicant has a medical condition that prevents administering a vaccine, as medically appropriate the Civil Surgeon or Panel Physician may waive such vaccines.