ARDMS OBGYN Ultrasound Flashcards for ARDMS OB/GYN Board Review. The program contains 778 flashcards that will help you study and pass the ARDMS OB/GYN boards to become a Registered Diagnostic Medical Sonographer. Here are the topics and flashcards included in this program: Fertility - 26 flashcards. General GYN - 54 flashcards. IUDs - 6 flashcards.