199+ Free RDMS Abdomen Practice Questions

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What is the normal sonographic appearance of the liver parenchyma?

Hyperechoic relative to renal cortex

Isoechoic or slightly hyperechoic relative to renal cortex

Hypoechoic relative to renal cortex

Anechoic with posterior acoustic enhancement

to track

2026 Statistics

Key Facts: RDMS Abdomen Exam

170

Exam Questions

ARDMS

555

Passing Score (Scaled)

ARDMS

3 hrs

Time Limit

ARDMS

$350

Exam Fee (includes SPI)

ARDMS 2026

25%

Largest Section

Liver/Biliary System

~70%

First-Time Pass Rate

Industry estimate

The ARDMS Abdomen specialty exam has approximately 170 multiple-choice questions over 3 hours with a passing score of 555 (scaled). The exam requires SPI certification as a prerequisite. Content emphasizes liver pathology (hepatic masses, cirrhosis, fatty liver), gallbladder/biliary disease (cholelithiasis, cholecystitis, CBD dilation), renal pathology (hydronephrosis, renal masses, stones), pancreatic pathology, splenic conditions, and abdominal vascular anatomy including Doppler assessment. First-time pass rates are approximately 70%.

Sample RDMS Abdomen Practice Questions

Try these sample questions to test your RDMS Abdomen exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 199+ question experience with AI tutoring.

1What is the normal sonographic appearance of the liver parenchyma?

A.Hyperechoic relative to renal cortex

B.Isoechoic or slightly hyperechoic relative to renal cortex

C.Hypoechoic relative to renal cortex

D.Anechoic with posterior acoustic enhancement

Explanation: Normal liver parenchyma appears isoechoic or slightly hyperechoic compared to the renal cortex. This comparison is important because the kidneys serve as a useful reference organ during abdominal ultrasound. The liver should never appear hypoechoic compared to the kidney in a normal study, and a hyperechoic liver may indicate fatty infiltration.

2Which ligament separates the left lobe of the liver from the caudate lobe?

A.Falciform ligament

B.Gastrohepatic ligament

C.Hepatogastric ligament

D.Venous ligament (ligamentum venosum)

Explanation: The ligamentum venosum (venous ligament) separates the left lobe of the liver from the caudate lobe. It appears as an echogenic linear structure on ultrasound and is the remnant of the ductus venosus from fetal circulation. The falciform ligament separates the medial and lateral segments of the left lobe.

3What is the main portal vein formed by the union of?

A.Superior mesenteric vein and splenic vein

B.Superior mesenteric vein and inferior mesenteric vein

C.Splenic vein and hepatic vein

D.Inferior mesenteric vein and splenic vein

Explanation: The main portal vein is formed by the union of the superior mesenteric vein (SMV) and the splenic vein. This junction typically occurs posterior to the neck of the pancreas. The portal vein carries nutrient-rich blood from the gastrointestinal tract to the liver for processing.

4Which hepatic vein drains directly into the inferior vena cava?

A.Only the right hepatic vein

B.Only the left hepatic vein

C.Right, middle, and left hepatic veins

D.Only the middle hepatic vein

Explanation: The right, middle, and left hepatic veins all drain directly into the inferior vena cava (IVC) at the level of the diaphragm. These veins are intersegmental in their course and are important landmarks for dividing the liver into segments according to Couinaud's classification.

5The ligamentum teres (round ligament) is the remnant of which fetal structure?

A.Ductus venosus

B.Umbilical vein

C.Umbilical artery

D.Ductus arteriosus

Explanation: The ligamentum teres (round ligament) is the remnant of the umbilical vein. It is located within the falciform ligament and appears as an echogenic focus on ultrasound. It serves as an important landmark dividing the medial and lateral segments of the left lobe of the liver.

6What is the normal diameter of the main portal vein?

A.Less than 10 mm

B.Less than 13 mm

C.Less than 16 mm

D.Less than 20 mm

Explanation: The normal diameter of the main portal vein is less than 13 mm. Measurements are typically taken at the porta hepatis where the portal vein enters the liver. A portal vein diameter greater than 13 mm may suggest portal hypertension, especially when accompanied by other signs such as splenomegaly or ascites.

7Which Couinaud segment corresponds to the caudate lobe?

A.Segment I

B.Segment IV

C.Segment V

D.Segment VIII

Explanation: Segment I corresponds to the caudate lobe. The Couinaud classification divides the liver into eight segments based on vascular supply. Segments II, III, and IVa/IVb make up the left lobe; segments V, VI, VII, and VIII make up the right lobe. The caudate lobe (Segment I) has its own vascular inflow and biliary drainage.

8What is the normal flow direction in the main portal vein?

A.Hepatofugal (away from the liver)

B.Hepatopetal (toward the liver)

C.Bidirectional

D.Absent

Explanation: Normal portal venous flow is hepatopetal, meaning blood flows toward the liver. This can be confirmed with color and spectral Doppler ultrasound. In portal hypertension, flow may become hepatofugal (reversed) or bidirectional, indicating advanced disease.

9Which of the following is the most common location for focal fatty sparing in the liver?

A.Anterior segment of the right lobe

B.Gallbladder fossa (adjacent to the gallbladder)

C.Superior segment of the left lobe

D.Caudate lobe

Explanation: Focal fatty sparing most commonly occurs adjacent to the gallbladder fossa, near the porta hepatis, or along the liver capsule. These areas appear as hypoechoic regions within a hyperechoic fatty liver and can be mistaken for masses. Understanding these typical locations helps differentiate sparing from true pathology.

10What is the characteristic ultrasound appearance of a simple hepatic cyst?

A.Hyperechoic with posterior shadowing

B.Anechoic with posterior acoustic enhancement and thin wall

C.Isoechoic with indistinct margins

D.Hypoechoic with internal echoes and thick wall

Explanation: A simple hepatic cyst appears anechoic (black) with a thin, imperceptible wall and demonstrates posterior acoustic enhancement. This is because fluid transmits sound waves better than surrounding tissue, creating increased through-transmission. These features differentiate simple cysts from complex cysts or solid masses.

About the RDMS Abdomen Exam

The RDMS Abdomen specialty exam assesses knowledge of abdominal sonographic anatomy, physiology, and pathology. The exam covers liver, gallbladder, biliary system, pancreas, kidneys, spleen, abdominal vasculature, and peritoneal cavity using diagnostic ultrasound techniques. Candidates must first pass the SPI (Sonography Principles & Instrumentation) exam.

Questions

170 scored questions

Time Limit

3 hours

Passing Score

Scaled score 555 (~70%)

Exam Fee

$350 (includes SPI prerequisite fee) (ARDMS (American Registry for Diagnostic Medical Sonography))

RDMS Abdomen Exam Content Outline

25%

Liver and Biliary System

Hepatic anatomy (segments, lobes, ligaments), liver pathology (hepatocellular carcinoma, metastases, hemangioma, cirrhosis, fatty liver), gallbladder pathology (cholelithiasis, cholecystitis, polyps, carcinoma), biliary anatomy and pathology (CBD stones, dilation, Klatskin tumor)

20%

Kidneys and Urinary System

Renal anatomy and variants, hydronephrosis grading, renal masses (RCC, angiomyolipoma, cysts - Bosniak classification), renal stones, renal Doppler (RAS evaluation), transplant kidney assessment, bladder pathology

15%

Pancreas and Spleen

Pancreatic anatomy, acute and chronic pancreatitis, pancreatic masses (adenocarcinoma, IPMN, neuroendocrine tumors), splenic anatomy, splenomegaly, splenic lesions, accessory spleen

20%

Abdominal Vasculature

Aorta and IVC anatomy, abdominal aortic aneurysm (AAA), mesenteric vessels (SMA, celiac axis), portal venous system, hepatic veins, Doppler waveform analysis, Budd-Chiari syndrome, portal hypertension

12%

Peritoneal Cavity and Other Structures

Ascites, peritoneal masses, lymphadenopathy, retroperitoneal structures, adrenal glands, abdominal wall pathology, fluid collections

Clinical Care and Patient Interaction

Patient preparation, scanning techniques, ergonomics, infection control, clinical indications, correlative imaging, report documentation

How to Pass the RDMS Abdomen Exam

What You Need to Know

Passing score: Scaled score 555 (~70%)
Exam length: 170 questions
Time limit: 3 hours
Exam fee: $350 (includes SPI prerequisite fee)

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

RDMS Abdomen Study Tips from Top Performers

1Master hepatic segmental anatomy - know the Couinaud classification and how to identify segments on ultrasound

2Study gallstone sonography thoroughly - wall-echo-shadow (WES) sign, posterior acoustic shadowing, and Murphy sign

3Know hydronephrosis grading: mild (splitting of central sinus), moderate (dilated calyces), severe (cortical thinning)

4Understand abdominal aortic aneurysm (AAA) measurement techniques and threshold for surgical repair (>5.5 cm)

5Master Doppler waveform patterns for hepatic artery, portal vein, hepatic veins, and renal arteries

6Study the Bosniak classification for renal cysts (I-IV) and management recommendations for each category

Frequently Asked Questions

What is the RDMS Abdomen specialty exam?

The RDMS (Registered Diagnostic Medical Sonographer) Abdomen specialty exam is administered by ARDMS to certify sonographers in abdominal imaging. The exam tests knowledge of abdominal anatomy, scanning techniques, pathology recognition, and Doppler assessment of abdominal organs and vasculature. Passing earns the RDMS credential with Abdomen (AB) specialty designation.

What are the prerequisites for the RDMS Abdomen exam?

Candidates must first pass the SPI (Sonography Principles & Instrumentation) exam before taking the Abdomen specialty exam. Additionally, you must meet one of ARDMS eligibility pathways: (1) Completion of a diagnostic medical sonography program, (2) Bachelor's degree with specific clinical experience, or (3) Other ARDMS-approved pathways including 12 months of clinical ultrasound experience.

How many questions are on the RDMS Abdomen exam?

The ARDMS Abdomen specialty exam contains approximately 170 multiple-choice questions. Candidates have 3 hours to complete the exam. Questions cover liver/biliary system (25%), kidneys/urinary (20%), abdominal vasculature (20%), pancreas/spleen (15%), peritoneal cavity (12%), and clinical care (8%).

What is the passing score for RDMS Abdomen?

The passing score is 555 on ARDMS's scaled scoring system (typically 300-700 scale). This equates to approximately 70% of questions answered correctly. ARDMS uses scaled scoring to ensure fairness across different exam forms. You receive preliminary results at the test center, with official scores within 30 days.

What organ systems are most tested on the Abdomen exam?

The liver/biliary system (25%) and kidneys/urinary system (20%) are the most heavily weighted, followed by abdominal vasculature (20%). Together these three areas account for 65% of the exam. Know hepatic segmental anatomy, gallstone sonographic findings, hydronephrosis grading, renal mass characteristics (Bosniak classification), and Doppler waveform interpretation for abdominal vessels.

How do I maintain my RDMS Abdomen credential?

RDMS credentials require recertification every 3 years. You must complete 36 continuing medical education (CME) credits during each 3-year cycle. ARDMS accepts CME from various providers including SDMS, AIUM, and other approved organizations. You can also recertify by retaking the specialty exam.