Certification: Sonography Principles and Instrumentation (SPI)

51 Monroe Street, Plaza East One, Rockville, Maryland 20850-2400

The Sonography Principles and Instrumentation (SPI) examination tests basic physical principles and instrumentation knowledge essential to sonography professionals and students.

To earn an RDMS, RDCS or RVT credential, you must pass the SPI examination and a corresponding specialty examination within five years. After passing the SPI examination, you can earn additional credentials without having to retake the SPI examination, provided you maintain active status.

More than two years of education or training after high school required?
More than two years of work experience required?
Oral or Written Exam Required?
Renewal Required?
Every 10 Year(s)


The certification has an education level of an Associates of Arts or Associates of Sciences degree or higher and has a work experience requirement of more than 2 years, or requires obtaining a ‘core’ level certification from the same organization.