BR vs OB/GYN: ARDMS Exam Comparison

This page compares the ARDMS Breast (BR) and Obstetrics & Gynecology (OB/GYN) exams side by side. Both are ARDMS-administered specialty examinations, but they differ in clinical scope, content focus, career setting, and 2025 pass-rate data.

BR vs OB/GYN: Exam Comparison

Factor	Breast (BR)	Obstetrics & Gynecology (OB/GYN)
Credential earned	RDMS	RDMS
Question count	170	170
Exam duration	3 hours	3 hours
2025 first-time pass rate	77%	80%

About the Breast (BR) Exam

The ARDMS Breast (BR) specialty exam covers breast anatomy, the ACR BI-RADS lexicon, benign and malignant pathology patterns, image-guided procedures, and supplemental screening. The BI-RADS framework is the organizational backbone of the entire exam and must be understood at a category-by-category level.

About the Obstetrics & Gynecology (OB/GYN) Exam

The ARDMS OB/GYN specialty exam has the highest first-time pass rate among all seven specialties (80% in 2025), but its content breadth is substantial. It covers the full spectrum of obstetric and gynecologic ultrasound: normal and abnormal pregnancy, fetal anatomy survey, biometry, Doppler surveillance, and gynecologic pathology.

Which Exam Should You Take First?

The right choice depends on your clinical background, your current employer's needs, and your long-term career goals. Sonographers with strong clinical experience in breast imaging should consider the BR exam first, as applied clinical knowledge transfers directly to board performance. Similarly, those working predominantly in obstetrics & gynecology settings will find the OB/GYN exam more immediately supported by their daily practice.

Both credentials are valuable additions to a multi-specialty credential portfolio. The 2025 first-time pass rates — 77% for BR and 80% for OB/GYN — underscore the importance of structured, domain-aligned preparation for whichever exam you choose first.

Dig Deeper Into Each Specialty

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