Step 3 is the final exam in the USMLE series of examinations. It is part of the licensing requirements for Doctors of Medicine (M.D.) and international medical graduates to practice medicine in the United States. The USMLE Step 3 exam is considered the final step in the series of medical licensure examinations. Generally, it is a pre-requisite of the majority of the state licensing boards. USMLE Step 3 tests several concepts that are often required to provide general health care to a patient. USMLE Step 3 is a mandatory exam that must be passed in order to obtain license as a practicing physician. Some International Medical Graduates are required to pass USMLE Step 3 in order to obtain an H1 Visa.