Abdomen (AB) Specialty Exam Prep

The ARDMS Abdomen (AB) specialty exam covers the liver, gallbladder, biliary system, pancreas, kidneys, spleen, retroperitoneum, and abdominal vasculature. It is one of the most commonly pursued RDMS specialty registrations and rewards systematic, organ-by-organ preparation aligned to the official content outline.

What the AB Exam Covers

The Abdomen registration is a 165-question, 3-hour examination administered by the ARDMS. Work through every content domain in proportion to its published weight rather than reviewing only familiar topics.

Who This Exam Is For

The AB credential suits both sonography students sitting for their first registration and practicing sonographers adding a new specialty. The outline covers material that may not come up in every clinical setting. Mapping each study block to a specific domain helps you review the published scope.

Exam Facts

• Credential earned: RDMS
• Exam format: 165-question, 3-hour examination
• Passing score: 555/700

2025 Pass Rates

First-time candidates: 73%; repeat candidates: 45%; overall: 67%. This 28-percentage-point difference compares separate candidate groups; it does not measure changes in exam difficulty or the effectiveness of a study strategy.

Source: ARDMS/APCA Global Exam Performance Summary Report, 2025.

High-Yield Focus Areas

• Liver pathology and diffuse disease patterns
• Biliary system anatomy and gallbladder pathology
• Renal anatomy, variants, and pathology
• Abdominal vascular anatomy and Doppler assessment
• Pancreatic anatomy and pathology identification

Common Mistakes to Avoid

• Confusing hepatic veins with portal veins on ultrasound
• Misidentifying gallbladder wall thickening causes
• Overlooking subtle renal mass characteristics
• Incorrectly measuring the common bile duct
• Missing pancreatic pathology due to bowel gas interference

Study Tips

• Master liver segmental anatomy using the Couinaud system before anything else
• Create comparison charts for diffuse liver diseases and their sonographic appearances
• Practice identifying normal vs. abnormal Doppler waveforms in hepatic and portal veins
• Study renal pathology in groups: cystic, solid, obstructive, and medical renal disease
• Use the ARDMS content outline to ensure you cover every tested organ system

Sample Question Types

Illustrative prompts, not actual registry questions.

• Identify the sonographic finding in this liver image
• What is the most likely diagnosis for a hypoechoic mass in the pancreatic head?
• Which measurement is used to assess for common bile duct dilation?
• A patient presents with RUQ pain and a positive Murphy sign. What is the most likely finding?

Key Topics

• Liver segmental anatomy
• Hepatic pathology
• Biliary system
• Gallbladder disease
• Pancreatic anatomy
• Splenic pathology
• Renal anatomy
• Urinary system
• Retroperitoneal structures
• Abdominal vasculature
• GI tract sonography
• Thyroid and neck structures
• Scrotum and testes

How to Prepare

Take specialty quizzes or a timed exam and review missed concepts using domain-level analytics. Platform question-bank inventory and mock exams are separate from official exam-format facts.

Related Specialties & Resources

Explore these related specialties when planning another registration:

• Obstetrics & Gynecology (OB/GYN) exam prep — AB vs OB/GYN comparison
• Breast (BR) exam prep — AB vs BR comparison
• Vascular Technology (VT) exam prep — AB vs VT comparison

Browse the seven ARDMS specialties we cover, weigh your options on the specialty comparison hub, or read study guides on the Ultrasound Analytics blog.