10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The RDMS exam has 165 questions and runs 3 hours.
These 10 free RDMS questions are organized by exam domain, so you can see how each part of the Registered Diagnostic Medical Sonographer - Abdomen (RDMS) blueprint is tested. Reveal the answer and explanation under each question.
In a transverse epigastric view, the splenic vein joins the superior mesenteric vein immediately behind a narrow segment of pancreatic tissue. Which part of the pancreas lies directly anterior to this venous confluence?
Correct answer: A - Neck
A smooth focal bulge projects from the lateral border of the left kidney beneath the spleen. Its cortex is continuous with adjacent cortex, and normal pyramids and vessels extend into it without displacement. What accounts for this contour?
Correct answer: B - Dromedary hump
Spectral Doppler of a patent hepatic vein shows two predominant phases of flow toward the right atrium and a brief reversed component during atrial contraction. The liver and inferior vena cava are otherwise unremarkable. The brief reversal represents:
Correct answer: D - Normal transmission of right atrial pressure
Gallstones and a 5-mm gallbladder wall are found in a patient with right upper-quadrant pain, heart failure, and generalized edema. Which additional observation most strongly favors acute cholecystitis over systemic gallbladder wall edema?
Correct answer: C - Maximal tenderness directly over the gallbladder with probe pressure
A 9-month-old has episodes of intense crying and vomiting separated by periods of unusual quietness. There has been no bloody stool. Right upper-quadrant ultrasound shows concentric bowel layers surrounding a core of mesenteric fat and vessels; longitudinal imaging demonstrates one bowel segment within another. The findings indicate:
Correct answer: B - Intussusception
A 16-year-old develops abrupt unilateral scrotal pain and nausea. Color flow remains visible within both testes, but the symptomatic side has a spermatic cord that spirals tightly around itself. The epididymis is not hyperemic. How should the preserved testicular flow affect the conclusion?
Correct answer: A - It does not exclude torsion when the spermatic cord is twisted
Hepatocellular carcinoma surveillance in an adult with cirrhosis identifies a new 16-mm solid liver observation that is not definitely benign. Liver visualization is adequate, and no internal flow is detected with optimized color Doppler. Under ACR LI-RADS US Surveillance v2024, which recommendation follows?
Correct answer: C - Obtain diagnostic multiphase contrast-enhanced CT or MRI for characterization
The main portal vein has an anechoic lumen but shows no color signal. The Doppler angle is favorable, color gain is just below the noise threshold, and the machine remains set to a high wall filter and a 60-cm/s color velocity scale from an arterial examination. What should the sonographer do next?
Correct answer: D - Lower the velocity scale and wall filter, then reassess flow
An interlobar renal artery in a 42-year-old yields a peak systolic velocity of 75 cm/s, an end-diastolic velocity of 15 cm/s, and a time-averaged mean velocity of 30 cm/s. Similar waveforms are obtained elsewhere in the kidney. Which resistive-index result and interpretation are justified?
Correct answer: C - RI 0.80; resistance is elevated, but the cause is nonspecific
During surveillance of a tortuous infrarenal aortic aneurysm, an oblique image gives an outer-wall diameter of 4.7 cm. After the transducer is aligned perpendicular to the vessel's local long axis, the maximum outer-wall diameter is 4.1 cm; the patent lumen measures 2.7 cm because of mural thrombus. Which diameter should be used for surveillance comparison?
Correct answer: B - 4.1 cm, measured across the entire vessel in the orthogonal plane
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