The Cardiovascular Credentialing International (CCI) credential Registered Cardiac Sonographer (RCS) credential holds equivalent recognition to the American Registry of Diagnostic Medical Sonography (ARDMS) Registered Diagnostic Cardiac Sonographer (RDCS) credential. As of September 2019 over 8,200 individuals hold an active RCS certification and over 25,000 individuals are credentialed across CCI’s nine certification programs.