FREE ARDMS RDMS Abdomen (AB) Exam Guide 2026: Pass on First Try

ARDMS RDMS Abdomen (AB) Exam Guide 2026: Pass the Abdominal Sonography Registry

The ARDMS Registered Diagnostic Medical Sonographer (RDMS) with the Abdomen (AB) specialty is the dominant credential for abdominal sonographers in the United States and Canada. It is what IAC-accredited ultrasound labs, radiology practices, academic medical centers, and hospital systems ask for when they hire — and the near-universal requirement for a staff general sonographer position that covers abdominal imaging.

This guide treats the AB exam the way high-scoring candidates actually do: as a breadth-of-pathology recognition challenge across every organ in the abdomen and pelvis, layered on top of protocol mastery, filtered through SPI Doppler and B-mode physics. By the end of this page you will know exactly what the exam tests, how to get eligible, what measurements and criteria to memorize cold, and how to pace a realistic 12-16 week prep.

FREE Abdomen practice questionsPractice questions with detailed explanations

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RDMS AB Exam At-a-Glance (SPI + Abdomen Structure)

The RDMS (AB) credential is not a single exam. It is a two-exam pathway through ARDMS.

You earn RDMS (AB) when you have passed both exams AND ARDMS has verified your prerequisite pathway documentation. If AB was passed first, you have 5 years from that date to complete SPI. If SPI was first, you have 5 years from SPI to complete AB. Additional RDMS specialties (OB/GYN, Breast, MSK, Fetal Echo) later do not require a repeat SPI as long as Active Status is maintained.

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Start Your FREE RDMS Abdomen Prep Today

Start FREE Abdomen Practice QuestionsPractice questions with detailed explanations

Our Abdomen question bank covers liver segmental anatomy and pathology, biliary/gallbladder criteria, pancreas, spleen, kidneys/adrenals, retroperitoneum, aorta/IVC, portal venous system, GI tract, peritoneum, scrotum, small parts, pediatric abdomen, noncardiac chest, interventional US, and SPI physics crossover — 100% FREE, with AI explanations for every question.

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What the RDMS AB Actually Is (and Why SPI Matters)

The Registered Diagnostic Medical Sonographer (RDMS) with the Abdomen specialty certifies that a sonographer can perform and interpret abdominal ultrasound studies across the full clinical spectrum. In plain English: you can acquire every standard abdominal view, run every relevant Doppler modality, generate every commonly reported measurement, and recognize every major pathology a radiologist is going to report on.

All of this rests on a physics foundation. That is why ARDMS requires SPI (Sonography Principles & Instrumentation) as a universal prerequisite for every specialty. SPI tests the physics of sound propagation, transducer design, pulsed vs continuous wave Doppler, aliasing and the Nyquist limit, spectral analysis, power/intensity, artifacts, bioeffects (TI/MI), and instrumentation controls.

Rule of thumb: SPI material is directly reusable on the AB exam — roughly 15-20% of AB items are physics-adjacent (artifact recognition on cine loops, Doppler optimization, transducer selection, harmonic imaging trade-offs). Studying SPI first and taking AB second is the cleanest path for most candidates.

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Who Should Take the RDMS AB?

The RDMS AB is the right credential if you fit one of these profiles:

1. Current General Sonographer Without ARDMS Credentials

You are working on experience or a non-ARDMS credential. RDMS is now effectively required for IAC-accredited labs, Medicare/Medicaid reimbursement on many services, and any lead tech role.

2. DMS Graduate With an Abdominal Rotation

You finished a CAAHEP-accredited Diagnostic Medical Sonography (DMS) program with a general or abdominal concentration. RDMS (AB) is the natural first credential and the quickest route to a full-time general sonography job.

3. RT(R) Radiographer Cross-Training Into Ultrasound

You are already ARRT radiography credentialed and want to add ultrasound. The ARRT path or the ARDMS allied health path (plus 12 months clinical US experience) both open RDMS (AB).

4. RN Pivoting Into Sonography

You are an RN with critical care, ED, or general medicine experience transitioning into sonography. The 12-month clinical ultrasound experience prerequisite applies; many RNs first work as a sonography assistant or student-tech to accumulate hours.

5. Allied Health Professional Transitioning

Respiratory therapists, radiation therapists, paramedics, and other allied health professionals can qualify through the allied health pathway with documented abdominal ultrasound experience.

6. Foreign-Trained Physician Transitioning to US

Licensed foreign MDs with abdominal ultrasound case work can qualify via the physician pathway (through APCA) with 500 documented cases and often work as sonographers while completing US medical licensing.

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Eligibility Pathways Deep Dive

ARDMS prerequisite rules are specific and documentation-heavy. Below are the 2026 pathways for the Abdomen exam. Always confirm against the current ARDMS Examination Applicant Prerequisites and Examination Requirements document before submitting your application.

Prerequisite 1: Allied Health Education + 12 Months Abdominal Ultrasound Experience

• Complete a 2-year patient-care-related allied health education program (RT, RRT, RDH, paramedic, RN associate, etc.).
• Accumulate 12 months of full-time clinical abdominal ultrasound experience (1,680 hours over a minimum of 48 weeks).
• Documentation: transcript, Clinical Verification (CV) form, CV narrative, government-issued ID.

Prerequisite 2: CAAHEP/CMA-Accredited DMS Program

• Graduate of (or current student within 60 days of graduation in) a CAAHEP-accredited (US) or CMA-accredited (Canada) DMS program with an abdominal track.
• Students may apply up to one year before program completion if they have completed 12 months of full-time clinical experience within the program curriculum.
• Program director verification letter required.
• The most streamlined pathway for DMS graduates.

Prerequisite 3A: Bachelor's Degree (Any Major) + 12 Months Abdominal Experience

• Bachelor's degree in any field (or foreign equivalent).
• 12 months of full-time clinical abdominal ultrasound experience (1,680 hours over 48+ weeks).
• Documentation: official transcript or foreign equivalency report, CV form, ID.

Prerequisite 3B: Bachelor's Degree in Sonography

• Graduate of (or student in) a bachelor's in sonography program.
• No additional clinical experience beyond program curriculum is required.
• Students may test up to one year before graduation with documented 12-month clinical experience within the program.

Prerequisite 5: Active ARRT or Other Applicable Credential

• Hold an active applicable credential from the American Registry of Radiologic Technologists (ARRT) or other ARDMS-accepted body.
• Documentation: copy of current credential in good standing, ID.
• Fastest pathway for already-credentialed radiographers crosswalking to RDMS.

Prerequisite 6: Physician Prerequisite (MD/DO/MBBS + 500 Cases)

• MD, DO license, or MBBS degree (US or foreign equivalent).
• Minimum of 500 clinical diagnostic abdominal ultrasound studies completed over a minimum of 6 months.
• Documentation: copy of current valid license, letter verifying clinical experience.
• Physician applications route through APCA (Alliance for Physician Certification & Advancement).

Documentation rule: ARDMS rejects incomplete applications outright and does not refund application fees (less the $100 processing fee). Before you pay, assemble your transcript, CV form, and any licensure paperwork as a single PDF packet ready to upload.

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SPI vs Abdomen — Order & Strategy

The #1 strategic question new candidates ask: take SPI or AB first?

There is no ARDMS rule about order. Both must pass within a rolling 5-year window. But the optimal sequence depends on your profile.

A common pacing mistake: taking AB first to "get clinical momentum" and then underestimating SPI. Candidates who fail SPI after passing AB often run into 5-year window pressure, especially if their AB pass is more than 3 years old by the time they finally retake SPI.

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SPI Deep Dive — What the Physics Exam Actually Tests

SPI is ~110 items over 2 hours covering wave physics, transducers, instrumentation, bioeffects, and artifacts. Treat it as a conceptual exam, not a math exam — the calculations that do appear are straightforward plug-ins.

Wave Physics

• Frequency, wavelength, speed (c = f × λ; c ≈ 1540 m/s in soft tissue).
• Period = 1 / frequency.
• Amplitude, intensity, attenuation (~0.5 dB/cm/MHz in soft tissue — memorize).
• Half-value layer concept; attenuation coefficient rises with frequency → depth/resolution trade-off.
• Propagation differences across media (bone >> soft tissue >> fluid >> air; impedance mismatch drives reflection).

Transducers

• Piezoelectric effect (PZT, lead zirconate titanate, and modern composite crystals).
• Matching layer (λ/4 thickness, impedance intermediate between crystal and skin).
• Backing (damping) material shortens spatial pulse length → improves axial resolution but reduces sensitivity.
• Axial resolution = SPL / 2 (better with higher frequency, shorter pulse).
• Lateral resolution = beam width at depth (improved by focusing, higher frequency, apodization).
• Elevational (slice-thickness) resolution = matrix array and 1.5D/2D arrays.
• Transducer types: linear (vascular, small parts), curved (abdomen, OB), phased array (cardiac, between-rib), endocavity (transvaginal, transrectal).

Pulse-Echo Instrumentation

• Pulse repetition frequency (PRF) determined by depth; deeper imaging → lower PRF.
• Nyquist limit = PRF / 2 for Doppler alias threshold.
• Gain, TGC (time-gain compensation), depth, sector width, focal zones, dynamic range, compression, persistence.
• Harmonic imaging (transmit f, receive 2f) improves SNR at depth and in technically difficult abdomens.
• Beam former, scan converter, display.

Doppler Physics

• Doppler equation: Δf = (2 × f₀ × v × cos θ) / c.
• Keep θ ≤ 60° for accurate velocity (cos 60° = 0.5, cos 90° = 0 — no signal at perpendicular).
• PW Doppler: range resolution, aliases above Nyquist; best for low velocities, known depth.
• CW Doppler: no range resolution, no aliasing; best for high velocities (AS jet, HOCM LVOT, but AB applications include severe RAS and AV fistulas).
• Color Doppler: PW-based → aliases; useful for flow localization and direction.
• Power Doppler: direction-agnostic, better sensitivity for slow flow (renal cortical perfusion, testicular torsion partial reperfusion).

Bioeffects & Safety

• Thermal Index (TI): TIS (soft tissue), TIB (bone), TIC (cranial). Keep < 1 for routine, < 0.7 for obstetric.
• Mechanical Index (MI) < 1.9 FDA limit; relevant for contrast bubble stability (low-MI imaging for CEUS).
• ALARA principle — as low as reasonably achievable.
• No confirmed bioeffects in diagnostic ultrasound at current output limits; avoid Doppler in 1st-trimester OB as a precaution.

Artifacts — High-Yield for SPI AND AB

Artifacts are a favorite AB exam topic because they drive diagnosis.

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RDMS AB Content Outline — Weighted Domains (2026)

ARDMS publishes the Abdomen Examination Content Outline annually. The current outline weights these domains (confirm on the ARDMS AB page before test day):

Pathology is the single largest domain and is also the domain where most failures occur. Below we dig into each organ system.

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AB Content Deep Dive — Organ by Organ

Liver

Anatomy — Couinaud Segments (memorize cold):

• Segment I — caudate lobe (between IVC and ligamentum venosum).
• Segment II — left lateral superior.
• Segment III — left lateral inferior.
• Segment IV — left medial (IVa superior / IVb inferior / quadrate).
• Segment V — right anterior inferior.
• Segment VI — right posterior inferior.
• Segment VII — right posterior superior.
• Segment VIII — right anterior superior.

Segments are defined by hepatic vein and portal vein branching (main, right, middle, left hepatic veins separate vertical planes; right/left portal vein separates cranial/caudal).

Normal measurements:

• Right lobe craniocaudal length: ≤ 15.5 cm (commonly ≤ 16 cm; above = hepatomegaly).
• Main portal vein diameter: ≤ 13 mm (portal HTN if > 13 mm).
• Portal vein flow: hepatopetal (toward liver), velocity 15-40 cm/s, low phasic variation.
• Hepatic vein flow: triphasic (w-shape) normally; becomes monophasic in cirrhosis/right HF.
• Hepatic artery resistive index (RI): 0.55-0.7 normal.

Liver Pathology — High-Yield:

Biliary System

Normal measurements:

• Gallbladder wall thickness: ≤ 3 mm (fasting).
• Common bile duct (CBD): ≤ 6 mm (under 60 y); ≤ 7-8 mm (60+ y); post-cholecystectomy may be up to 10 mm.
• Intrahepatic duct: non-visualized normally; visualized = dilated.

Biliary Pathology — High-Yield:

Pancreas

Normal measurements:

• Head: ≤ 3.0 cm AP.
• Body: ≤ 2.5 cm AP.
• Tail: ≤ 2.0 cm AP (often obscured by bowel gas).
• Main pancreatic duct (duct of Wirsung): ≤ 2-3 mm.

Pancreas Pathology — High-Yield:

Spleen

Normal measurements:

• Length: ≤ 12 cm (splenomegaly if > 12-13 cm).
• Accessory spleen common (< 2-3 cm) near splenic hilum.

Splenic Pathology:

• Splenomegaly — portal HTN, infection (mono), hematologic malignancy, storage disease.
• Splenic cyst — epidermoid (congenital) vs post-traumatic.
• Splenic infarct — wedge-shaped hypoechoic peripheral lesion.
• Splenic rupture — trauma; subcapsular hematoma, hemoperitoneum (FAST positive).
• Splenic artery aneurysm — most common visceral artery aneurysm; risk in pregnancy.

Kidneys, Adrenals, and Retroperitoneum

Normal renal measurements:

• Renal length: 9-12 cm (adult).
• Cortical thickness: > 1 cm normal; thinning in CKD.
• Discrepancy > 2 cm between kidneys is abnormal.

Renal Pathology — High-Yield:

Adrenals: Usually non-visualized in adults; visible mass > 2 cm. Pediatric adrenal hemorrhage, neuroblastoma.

Retroperitoneum: Retroperitoneal fibrosis, lymphoma (confluent bulky nodes), psoas abscess, hematoma.

Abdominal Vessels — Aorta, IVC, Portal System

Aorta:

• Normal AP diameter: ≤ 3.0 cm.
• AAA definition: > 3.0 cm.
• Surgical/endovascular repair threshold: ≥ 5.5 cm (men) / ≥ 5.0 cm (women); growth > 0.5 cm in 6 months; symptomatic regardless of size.
• Measure outer-to-outer wall in true transverse (perpendicular to long axis) to avoid overestimation on oblique cuts.
• Surveillance: yearly if 3-4 cm; every 6 months if 4-5 cm; every 3 months if > 5 cm.
• Dissection: intimal flap, dual lumen, differential flow on color.
• Retroperitoneal hematoma / ruptured AAA: periaortic hypoechoic collection; emergent CT/repair.

IVC:

• Normal diameter: ≤ 2.1 cm at subxiphoid.
• Plethoric IVC (> 2.1 cm with < 50% respiratory collapse) suggests elevated right atrial pressure.
• IVC filters (Greenfield, Günther Tulip, etc.) placed infrarenally for PE prophylaxis when anticoagulation contraindicated; US confirms placement and checks for thrombus, tilt, migration, or strut perforation.
• IVC tumor thrombus from RCC extends through right renal vein into IVC ± right atrium.

Portal Venous System — Portal Hypertension:

Portal HTN develops with cirrhosis, portal/splenic vein thrombosis, or hepatic vein occlusion (Budd-Chiari).

Peritoneum & GI Tract

• Ascites — anechoic (exudate may have echoes); Morrison pouch / hepatorenal space is most dependent supine (FAST).
• Hemoperitoneum — trauma FAST; echogenic complex fluid.
• Appendicitis — non-compressible tubular structure > 6 mm OD with wall thickening, periappendiceal fluid, increased color flow, hyperechoic fat; primary modality in pediatrics/pregnancy.
• Intussusception — target/pseudokidney sign; doughnut sign on transverse; ileocolic most common pediatric.
• Pyloric stenosis (infant) — pyloric muscle thickness > 3-4 mm, pyloric length > 15-17 mm, non-passage of fluid.
• Inflammatory bowel disease — wall thickening > 3-4 mm, loss of wall stratification, mesenteric inflammation.
• Small bowel obstruction — dilated loops > 2.5 cm, absent/to-and-fro peristalsis.

Scrotum, Thyroid & Small Parts

Scrotum:

• Testicular torsion — absent intratesticular arterial flow; bell-clapper deformity predisposition; < 6 hours window for salvage. Always compare to contralateral side.
• Epididymo-orchitis — enlarged hyperemic epididymis/testis, hydrocele.
• Varicocele — dilated pampiniform plexus > 2-3 mm, Valsalva augmentation; usually left-sided.
• Testicular mass — seminoma (homogeneous hypoechoic), non-seminoma (heterogeneous); all solid intratesticular masses malignant until proven otherwise.
• Hydrocele — anechoic surrounding testis.

Thyroid:

• Size: 4-6 cm length, 1.3-1.8 cm AP per lobe normally.
• TI-RADS nodule risk stratification (composition, echogenicity, shape taller-than-wide, margin, echogenic foci).
• Graves — diffusely enlarged, hypoechoic, markedly hypervascular ("thyroid inferno").
• Hashimoto — heterogeneous, hypoechoic, pseudolobulation.

Parathyroid, breast, superficial structures as per current outline.

Noncardiac Chest

• Pleural effusion — anechoic fluid above diaphragm; sine wave / jellyfish sign (atelectatic lung).
• Pneumothorax — absent lung sliding, absent B-lines, lung point sign (specific).
• Diaphragmatic dysfunction — paradoxical motion or reduced excursion on M-mode.

Pediatric Abdomen

• Pyloric stenosis (HPS) — already covered.
• Intussusception — already covered.
• Hepatoblastoma — most common pediatric primary liver malignancy; AFP elevated.
• Wilms tumor — large heterogeneous renal mass < 5 years old.
• Neuroblastoma — adrenal/sympathetic chain mass, often with calcifications, crosses midline.
• Urinary tract — VUR/hydronephrosis; duplex collecting systems.
• Neonatal adrenal hemorrhage — heterogeneous suprarenal mass, resolves over weeks.
• Infantile hemangioma of liver — hypervascular; high-output heart failure risk.

Interventional Ultrasound

• Guidance — freehand vs needle-guide attachment; in-plane vs out-of-plane.
• Biopsies — liver, kidney, thyroid, lymph node, pancreatic (EUS-FNA).
• Drainages — abscess, ascites (paracentesis), pleural (thoracentesis).
• Vascular access — dynamic US guidance for central lines.
• Pre-procedure — coagulation status (INR, platelets), ultrasound mapping of target + safe window.
• Post-procedure — hemostasis check, immediate complication scan.

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Cost Stack — What RDMS (AB) Actually Costs in 2026

FREE Abdomen practice questionsPractice questions with detailed explanations

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Registration via Pearson VUE

1. Create an ARDMS account at ardms.org and complete the online application for both SPI and AB.
2. Upload prerequisite documentation (transcript, CV form, ID, letters).
3. Pay exam fees ($275 SPI + $300 AB = $575 baseline).
4. ARDMS reviews application (typically 10-15 business days).
5. Receive Examination Confirmation Letter (ECL) with 90-day scheduling window.
6. Schedule at Pearson VUE (pearsonvue.com/ardms); testing at any US, Canada, Mexico, or international center.
7. Arrive 30 minutes early on test day with two forms of ID (one government photo matching ECL name exactly).

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Recertification & MOC: What Changed in 2026

ARDMS modernized its Maintenance of Certification (MOC) program effective January 1, 2026. The big changes:

1. Knowledge Confirmation (KC) quizzes — new annual requirement. All active ARDMS certificants now complete four short specialty-specific KC quizzes each year on the SKILLS Platform (quizzes released quarterly). Your first set is due December 31, 2026. These replace the prior decennial reexam.
2. Reduced CME load. The CME requirement is 25 ARDMS/APCA-accepted CME credits per 3-year cycle (reduced from 30) for CME periods ending December 31, 2026 and beyond, submitted by December 31. A late window exists with an additional late fee.
3. Annual attestation + renewal fee. $105/year for RDMS (same flat fee as RDCS, RVT, RMSKS) by December 31.
4. No more decennial reexamination for active-status sonographers in good standing. Lapsed credentials still require retaking BOTH SPI and the specialty exam.

If you hold multiple specialties (e.g., RDMS AB + RDMS OB/GYN + RVT), you complete KC quizzes for each specialty each year. Total annual time investment is approximately 1-2 hours.

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12-16 Week Study Plan

Use the long plan (16 weeks) if you are new to abdominal sonography or out of school more than 2 years. Use the short plan (12 weeks) if you recently completed a DMS program with abdominal rotations. Adjust either up or down based on your diagnostic starting point — always begin with a diagnostic practice block of 50-75 items to identify weaknesses.

Weeks 1-2: Foundation + SPI Physics

• Read Edelman's Sonography Principles & Instrumentation 9th ed chapters 1-5 (wave physics, transducers, artifacts, bioeffects).
• Take a 50-item diagnostic across all AB domains to baseline.
• Drill 20-30 practice questions per day (mixed SPI).

Weeks 3-4: Liver & Biliary Deep Dive

• Rumack Diagnostic Ultrasound liver and biliary chapters.
• Memorize Couinaud segments with hepatic and portal vein landmarks.
• Learn GB wall thickness, CBD size, WES sign, acute cholecystitis criteria.
• 30 mixed practice questions daily.

Weeks 5-6: Pancreas, Spleen, & Retroperitoneum

• Penny AB review pancreas and spleen chapters.
• Pseudocyst vs IPMN vs mucinous cystic neoplasm differentiation.
• Splenomegaly causes, splenic rupture FAST findings.
• 30-40 daily practice questions.

Weeks 7-8: Kidneys, Adrenals, & Genitourinary

• Rumack renal chapter cold.
• Bosniak cyst classification, RCC, AML, ADPKD, hydronephrosis grading.
• Renal Doppler: PSV > 180 cm/s for RAS, RAR > 3.5, tardus-parvus waveform.
• Transplant kidney RI > 0.8 red flag.
• 40 daily practice questions.

Weeks 9-10: Aorta, IVC, Portal System

• AAA measurement technique (outer-to-outer transverse).
• Portal HTN criteria: PV > 13 mm, hepatofugal flow, collaterals.
• Budd-Chiari, TIPS surveillance.
• IVC filter, IVC tumor thrombus.
• 40 daily practice questions.

Weeks 11-12: GI Tract, Peritoneum, Pediatric Abdomen, Interventional

• Appendicitis, intussusception, pyloric stenosis protocols.
• FAST exam views and application.
• Biopsy and drainage guidance principles.
• Pediatric masses (Wilms, neuroblastoma, hepatoblastoma).

Weeks 13-14: Scrotum, Thyroid, Small Parts, Noncardiac Chest

• Testicular torsion, varicocele, testicular mass.
• TI-RADS thyroid nodule stratification.
• Pleural effusion, pneumothorax, diaphragmatic motion.
• Full instrumentation and contrast (CEUS) review.

Week 15: Full Timed Mock + Remediation

• One full timed mock (3 hours, ~165 items).
• Error-log review; rework weakest domain for 3-4 days.
• Second full timed mock.

Week 16: Final Review + Test Day

• Error-log review ONLY — no new material.
• Light review the day before; sleep 8+ hours.
• Test day.

If you have only 12 weeks, compress weeks 1-2 with 3-4 (two weeks of foundation + SPI), combine 5-8 into 4 weeks (pancreas/spleen/renal), combine 9-12 into 4 weeks (vascular + GI + small parts + interventional), and keep the final 2 weeks for mocks and remediation.

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Recommended Study Resources

These are the texts most high-scoring AB candidates use.

• Penny, Sonography: Introduction to Normal Structure and Function / Examination Review for Ultrasound: Abdomen — the single most frequently recommended abdomen registry review. Closely aligned with AB outline.
• Rumack, Diagnostic Ultrasound (2-volume) — the reference textbook for abdominal ultrasound. Chapters on liver, biliary, pancreas, spleen, kidneys, aorta, GI, and small parts are essential.
• Edelman, Understanding Ultrasound Physics, 9th ed (2025) — the dominant SPI review text. Physics for AB-adjacent items lives here.
• Kremkau, Sonography Principles and Instruments — a strong alternative/complement to Edelman for physics.
• Hagen-Ansert, Textbook of Diagnostic Sonography — widely used DMS program textbook, good for general anatomy and protocols.
• ARDMS Abdomen Content Outline (free) — read this directly; the exam is written from the outline.
• Inteleos/ARDMS Practice Exam (paid) — consider purchasing one late in prep as a pacing check.
• 123Sonography.com — free and paid image galleries and case-based content; strong for cine-loop pattern recognition.
• AIUM/SRU guidelines (free) — thyroid TI-RADS, liver LI-RADS, aorta surveillance; the AB exam pulls from these.

free Abdomen practice questionsPractice questions with detailed explanations

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Test Day Logistics

• Arrive 30 minutes early at the Pearson VUE test center. Late arrival of >15 minutes forfeits the exam with no refund.
• Bring two forms of ID, one government-issued photo with signature, matching the name on your ECL exactly.
• No personal items in the testing room: no phone, watch, notes, food, drink, hat. Pearson VUE lockers are provided.
• The computer provides an on-screen calculator (basic four-function). Practice mental math for renal-aortic ratio, AAA measurements, and hepatic segment localization.
• Time budget: 3 hours for ~165 items = ~60-65 seconds per item. Mark-and-return is available. Flag every item you are >90 seconds on, answer your best guess, move forward, return at the end.
• Expect hotspot items on cine loops or still images — you click to identify a structure, measurement caliper, or pathologic finding. Practice these before test day.
• After submission, you receive printed preliminary Pass/Fail at the test center; final scaled score arrives within 10 business days.

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Common AB Mistakes (and Fixes)

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Career & Salary 2026

Per the U.S. Bureau of Labor Statistics Occupational Outlook Handbook (SOC 29-2032/29-2033, Diagnostic Medical Sonographers):

• Median annual wage (May 2024): ~$80,000 for DMS category.
• RDMS AB staff sonographers: typically clear $75,000-$95,000 with 2-5 years of experience.
• Senior/lead sonographers at academic medical centers: $95,000-$115,000.
• Travel sonographers: $2,200-$3,500/week gross (roughly $115,000-$180,000 annualized) depending on market and specialty mix.
• Dual-credentialed RDMS AB + OB/GYN or RDMS AB + RVT sonographers routinely earn 10-20% above single-credential peers because they can cover more workflows.
• Projected growth 2024-2034: ~11% for DMS overall (much faster than average). Sustained demand is driven by aging population, chronic liver/kidney disease management, point-of-care ultrasound expansion, and radiation-free imaging preference in OB and pediatric settings.

Cities with the largest DMS demand (2024-2026 hiring data): New York, Boston, Philadelphia, Houston, Dallas, Chicago, Los Angeles, San Francisco, Seattle, and major academic medical centers nationwide.

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RDMS AB vs Other RDMS Specialties: Which Track First?

Practical strategy: Most general sonographers start with RDMS AB because it has the broadest job market, is offered On Demand at Pearson VUE, and opens general sonography positions immediately. RDMS OB/GYN is the most common add-on. Specialty combinations (AB + OB + MSK, etc.) drive compensation upside.

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Final Step: Start Your FREE RDMS AB Prep

Begin FREE Abdomen Practice NowPractice questions with detailed explanations

You have the content outline, the organ-by-organ pathology playbook, the Doppler criteria, the 12-16 week plan, and the test-day logistics. The last missing piece is high-volume deliberate practice. Our free Abdomen question bank gives you:

• Hundreds of exam-style questions across all AB domains
• Detailed AI-powered explanations for every item
• Mixed timed blocks for pacing practice
• Doppler criterion drills (RAS, portal HTN, aortic measurements)
• SPI physics crossover items with abdominal imaging context
• Hotspot-style items on cine loops and still images
• Performance tracking by organ system so you see your weak spot
• 100% FREE — no paywall, no email gate

Start a timed block today. Build the daily habit. Pass the RDMS Abdomen exam on your first attempt.

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Official Sources

• ARDMS (American Registry for Diagnostic Medical Sonography) — Examination Applicant Prerequisites and Examination Requirements document; RDMS AB and SPI exam specifications; Abdomen Examination Content Outline; annual Global Exam Performance Summary; 2026-1 fee schedule; MOC/Knowledge Confirmation program updates. ardms.org.
• Pearson VUE — test center delivery, scheduling, and testing policies for ARDMS exams. pearsonvue.com/ardms.
• AIUM (American Institute of Ultrasound in Medicine) — Practice Parameters for Abdominal Ultrasound, Renal Ultrasound, and other organ-specific guidance. aium.org.
• SRU (Society of Radiologists in Ultrasound) — Thyroid TI-RADS, LI-RADS, and consensus statements. sru.org.
• Intersocietal Accreditation Commission (IAC) Vascular & Ultrasound — abdominal ultrasound standards and accreditation requirements. intersocietal.org.
• U.S. Bureau of Labor Statistics — Occupational Outlook Handbook, Diagnostic Medical Sonographers (29-2032/29-2033), May 2024 wage and 2024-2034 projections. bls.gov/ooh.
• Penny, Examination Review for Ultrasound: Abdomen and Obstetrics & Gynecology — review textbook.
• Rumack, Diagnostic Ultrasound (2-volume reference) — reference textbook.
• Edelman, Understanding Ultrasound Physics, 9th ed (2025) — SPI reference.
• Society of Diagnostic Medical Sonography (SDMS) — online CME library for ARDMS renewal credits. sdms.org.