The Registered Diagnostic Cardiac Sonographer credential — RDCS — is awarded by the American Registry for Diagnostic Medical Sonography (ARDMS) to cardiac sonographers who pass two examinations within five years of each other: the Sonography Principles and Instrumentation (SPI) examination and a cardiac specialty examination, most commonly Adult Echocardiography. The PassProfessor Registered Diagnostic Cardiac Sonographer (RDCS, ARDMS) program prepares candidates for that route, centered on the Adult Echocardiography examination, and its companion guide, the RDCS exam guide at /rdcs-exam-guide/, works through the credential in full depth.
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What this credential certifies
An RDCS is a cardiac sonographer whose competence in echocardiography has been examined by ARDMS, a council of Inteleos. The work the credential certifies is the diagnostic ultrasound examination of the heart: normal and abnormal cardiac anatomy and physiology, pathology and hemodynamics, postoperative evaluation, and the measurements and views from which cardiologists diagnose and follow disease. Holders work in echocardiography laboratories, cardiac imaging centers, and hospitals. The credential is earned in a specialty: Adult Echocardiography (AE) is the route most adult-practice sonographers take, and Pediatric Echocardiography (PE) and Fetal Echocardiography (FE) stand as the credential’s other specialty examinations. This program is built around the Adult Echocardiography examination, the RDCS route’s center of gravity.
The fence around this credential matters, because cardiac sonography is certified by more than one body and the initials invite confusion. RDCS is an ARDMS credential, earned through ARDMS examinations including SPI. It is not the Registered Cardiac Sonographer (RCS) credential offered by Cardiovascular Credentialing International (CCI): CCI is a different certifying body, RCS is a different credential, and the CCI examination is a different examination with its own eligibility rules and content. A candidate preparing for one body’s paper gains nothing from material built for the other’s, and employers who specify a credential specify a body. Everything on this page — the examinations, the outline, the scoring, the fee — is the ARDMS position, stated as ARDMS publishes it.
Like every ARDMS credential, the RDCS has a two-examination structure. The specialty examination alone awards nothing: the credential is earned when the candidate has also passed SPI, with both passes falling within five years of each other, in either order. Eligibility runs through ARDMS’s published prerequisite pathways, combining education with clinical experience, before either examination can be applied for.
The examination at a glance
| Item | Verified position |
|---|---|
| Program | Registered Diagnostic Cardiac Sonographer (RDCS, ARDMS): preparation for the ARDMS route to the RDCS credential, centered on the Adult Echocardiography (AE) specialty examination |
| Certifying body | American Registry for Diagnostic Medical Sonography (ARDMS), a council of Inteleos. Not Cardiovascular Credentialing International (CCI), which offers the separate RCS credential |
| Examinations required | Two: the Sonography Principles and Instrumentation (SPI) examination and a specialty examination (Adult Echocardiography, Pediatric Echocardiography, or Fetal Echocardiography), passed within five years of each other, in either order |
| Adult Echocardiography examination | Approximately 150 multiple-choice questions over three hours, including hotspot questions and a five-minute survey |
| Passing standard | ARDMS scores the AE examination on a scale of 300 to 700; a scaled score of 555 or better passes, exactly as ARDMS publishes it. A scaled score is not a percentage |
| Content weighting (AE) | Anatomy and Physiology 15%; Pathology 40%; Clinical Care and Safety 11%; Measurement Techniques, Maneuvers, and Sonographic Views 25%; Instrumentation, Optimization, and Contrast 9%, per the ARDMS Adult Echocardiography content outline |
| Examination fee (ARDMS’s fee) | $300 USD for the Adult Echocardiography examination, as published by ARDMS |
| Credential maintenance | Annual renewal with attestation, and 30 ARDMS-accepted continuing medical education credits in each three-year CME period |
| Administrator note | PassProfessor is independent and is not affiliated with ARDMS, Inteleos, or CCI |
What the Adult Echocardiography examination covers
The Adult Echocardiography examination is organised into five domains. Its weighting states the specialty’s priorities plainly: pathology alone is two-fifths of the paper, and measurement technique is the next largest share — this is an examination about recognising disease and quantifying it.
Anatomy and Physiology (15%). Normal cardiac anatomy: the chambers, valves and their structure, the great vessels, the pericardium, wall segments and their nomenclature, and normal variants. Normal physiology: the cardiac cycle and its phases, systolic and diastolic function, valve function, venous return, and the response to stress testing. This domain is the map every other domain is drawn on — a candidate who cannot place a structure or a phase cannot reason about its disease.
Pathology (40%). The examination’s center of gravity. Abnormal physiology and perfusion; valvular disease in full — stenosis and regurgitation at each valve, assessed and graded; ischemic heart disease and segmental wall motion abnormalities; cardiomyopathies and diastolic dysfunction; pericardial disease; endocarditis; cardiac thrombi, masses and tumors; congenital heart disease as it presents in adult practice, including septal defects, coarctation of the aorta and Ebstein anomaly; disease of the aorta and the pulmonary artery; prosthetic valves and postoperative evaluation; and arrhythmias and conduction disturbances as they appear to the echocardiographer.
Clinical Care and Safety (11%). The conduct of the examination as patient care: preparing and monitoring the patient, infection control and safety practice, recognising the patient whose condition changes the examination’s priorities, and working safely with the equipment and the clinical environment of the echo laboratory.
Measurement Techniques, Maneuvers, and Sonographic Views (25%). The quantitative craft: 2D and M-mode imaging and measurement, spectral and colour Doppler, tissue Doppler, chamber quantification, ejection fraction and volumes, valve areas and gradients, diastolic function assessment, shunt quantification, the standard sonographic views and how each is obtained, and the provocative maneuvers — Valsalva and positional change among them — that reveal what resting images conceal.
Instrumentation, Optimization, and Contrast (9%). The machine as an instrument: transducer selection and management, image optimisation, Doppler concepts applied at the console, artifacts and their correction, and the use of contrast. The domain is the smallest on this paper because the physics and instrumentation foundation is examined in depth on SPI, the companion examination every RDCS candidate must also pass.
What makes this examination distinct and demanding
The AE paper is demanding because echocardiography is a performed skill examined on paper, and the examination knows it. Hotspot questions ask the candidate to mark a structure or finding directly on an image, so anatomy that is known as a list but not recognised in a parasternal or apical view does not score. Pathology at 40 percent means the candidate is judged mainly as a diagnostician: distinguishing stenosis from regurgitation and grading severity from Doppler data, reading wall motion as a coronary map, separating cardiomyopathies that look alike until their measurements are compared. Measurement at 25 percent adds the arithmetic of the laboratory — gradients, areas, volumes, ejection fraction — where a method error and a calculation error produce the same wrong answer. And the route itself enforces breadth: SPI examines the physics underneath every image, and both passes must land within five years of each other. A scaled score of 555 on a 300-to-700 scale is the standard, and no percentage target substitutes for it.
The route, in order
The route runs: qualify through one of ARDMS’s published prerequisite pathways — the principal pathways pair education with clinical experience: a two-year allied health education program plus twelve months of full-time clinical ultrasound or vascular experience; graduation from a programmatically accredited sonography program, in which the clinical requirement is covered by the program; a bachelor’s degree plus twelve months of full-time clinical experience; a bachelor’s degree in sonography or vascular technology; the physician pathway; or an existing credential ARDMS accepts under its published chart — with Clinical Verification of experience as the pathway requires — apply to ARDMS for the examinations — pass a cardiac specialty examination and the SPI examination, in either order, within five years of each other — and receive the RDCS credential in that specialty. For most candidates the specialty is Adult Echocardiography; sonographers whose practice is paediatric or fetal take Pediatric Echocardiography or Fetal Echocardiography instead, and a specialty earned also stands as a qualifying specialty toward the RDMS credential in the fetal case, as ARDMS publishes it. One result rule belongs in every candidate’s plan: a candidate who does not pass the AE examination may reapply after three days but must wait 60 days before retaking it, so a first sitting scheduled early protects the calendar in a way a last-minute sitting cannot.
Staying certified: annual renewal and the three-year CME cycle
ARDMS certification is maintained, not held passively. Registrants renew annually, paying the annual renewal fee and attesting that they follow ARDMS rules and compliance policies and will complete their continuing education on time. Across each three-year CME period, a registrant holding the RDCS credential must earn 30 ARDMS-accepted continuing medical education credits; ARDMS audits CME records, so certificates should be retained. Annual renewal and the CME cycle run on separate clocks, and both must be honoured for the credential to remain in good standing.
What the PassProfessor program will cover
Built to the ARDMS Adult Echocardiography outline, in its published proportions. The program is organised by the AE examination’s five domains — pathology first, as the examination weights it, measurement technique second — with image-led practice that reflects the paper’s hotspot items as well as its multiple-choice questions. The companion RDCS exam guide at /rdcs-exam-guide/ sets the outline out in full, domain by domain.
One body, one examination, stated plainly throughout. This program prepares candidates for the ARDMS examinations — SPI and the specialty paper — for the RDCS credential. It is not preparation for CCI’s RCS examination, and no material in it is borrowed from the CCI outline; candidates whose employer or plan calls for RCS should prepare for that credential with its own body.
Independence, stated plainly. PassProfessor is an independent preparation provider, not affiliated with ARDMS, Inteleos, or CCI, and this program is not an ARDMS course. Completing it confers no credential and no eligibility; ARDMS alone certifies, and candidates apply and sit through ARDMS.
Tell me when enrollment opens. The Registered Diagnostic Cardiac Sonographer (RDCS, ARDMS) program is in the works and enrollment is not yet open. Leave an email address and PassProfessor will write to you when the program is ready — and only about this program. No date is promised, because the program will open when it meets the standard described above, not before.
Frequently asked questions
Who awards the RDCS credential?
The American Registry for Diagnostic Medical Sonography (ARDMS), a council of Inteleos. RDCS stands for Registered Diagnostic Cardiac Sonographer.
Is the RDCS the same as the RCS?
No. RDCS is awarded by ARDMS and is earned through the ARDMS examinations, including SPI. RCS — Registered Cardiac Sonographer — is awarded by Cardiovascular Credentialing International (CCI), a different certifying body, through a different examination with its own eligibility rules and content outline. The two credentials are not interchangeable, and preparation for one is not preparation for the other.
Which examinations must I pass for the RDCS?
Two: the Sonography Principles and Instrumentation (SPI) examination and one cardiac specialty examination — Adult Echocardiography (AE), Pediatric Echocardiography (PE), or Fetal Echocardiography (FE). Both must be passed within five years of each other, in either order.
How many questions are on the Adult Echocardiography examination, and how long does it take?
Approximately 150 multiple-choice questions over three hours, including hotspot questions — answered by marking directly on an image — and a five-minute survey.
What score passes the AE examination?
ARDMS scores the examination on a scale of 300 to 700, and a scaled score of 555 or better passes, exactly as ARDMS publishes it. The scaled score is not a percentage and is not curve-based.
How is the AE examination weighted?
Per the ARDMS Adult Echocardiography content outline: Pathology 40%; Measurement Techniques, Maneuvers, and Sonographic Views 25%; Anatomy and Physiology 15%; Clinical Care and Safety 11%; Instrumentation, Optimization, and Contrast 9%.
How much does the AE examination cost?
ARDMS publishes a fee of $300 USD for the Adult Echocardiography examination. That is ARDMS’s examination fee, not a PassProfessor price.
Who is eligible to apply?
Candidates qualify through one of ARDMS’s published prerequisite pathways, which combine education with clinical experience — for example, a two-year allied health program with twelve months of full-time clinical experience, graduation from a programmatically accredited sonography program, or a bachelor’s degree with twelve months of clinical experience — with Clinical Verification as the pathway requires.
What happens if I do not pass the AE examination?
You may reapply after three days, but you must wait 60 days before retaking the examination. Scheduling a first attempt with time in hand protects the five-year window and the calendar generally.
How is the credential maintained?
Registrants renew annually with attestation and earn 30 ARDMS-accepted continuing medical education credits in each three-year CME period. ARDMS audits CME records.
Is PassProfessor affiliated with ARDMS or CCI?
No. PassProfessor is an independent preparation provider, affiliated with neither body. ARDMS alone awards the RDCS credential and sets its rules.
When does enrollment open?
The program is in the works and enrollment is not yet open. Leave an email address on this page and PassProfessor will write to you when the program is ready — and only about this program.