Compare ARDMS Specialty Exams Side by Side

Choosing a sonography credential is a long-term career decision, and the seven ARDMS registrations differ in more ways than most candidates expect. This hub pairs up any two specialty exams so you can weigh first-time pass rates, relative difficulty, question counts, content domains, typical clinical settings, and the study time each one demands. Select a pairing below or browse all 21 available head-to-head guides.

Some sonographers are deciding which credential to earn first; others already hold one registration and are mapping out a second to broaden their scope or qualify for a different role. Either way, a direct comparison makes the trade-offs clear. Abdomen and OB/GYN open the widest range of general-imaging jobs, Vascular Technology and Fetal Echocardiography lead toward specialized cardiovascular and maternal-fetal work, and Sonography Principles and Instrumentation (SPI) is the shared physics prerequisite that every RDMS and RVT candidate must pass.

Each guide also explains how the exams overlap. Several specialties share anatomy, Doppler hemodynamics, and instrumentation knowledge, so candidates who plan their sequence carefully can reuse a large part of their preparation rather than starting over for every registration. Knowing where two exams diverge — and where they reinforce each other — helps you build a realistic study schedule around your work and clinical hours.

All ARDMS Specialty Comparison Pages

2025 ARDMS Pass Rates at a Glance

When comparing specialties, first-time pass rates are a key planning input. 2025 first-time pass rates: OB/GYN 80% (highest), Breast 77%, SPI 74%, Fetal Echocardiography 75%, Abdomen 73%, Pediatric Sonography 71%, Vascular Technology 70% (lowest). Repeat-taker rates are significantly lower across all specialties — averaging 27 percentage points below first-time rates — which makes first-attempt preparation strategy critical.