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SPI · Sonography Principles & Instrumentation
Pass the SPI — or get every dollar back. Guaranteed.
Don't pass? Standard refunds you — and SurePass pays your $275 retake fee
Physics is the exam sonographers fail. Know exactly what to study and the moment you're ready to sit.
From $89 · Starter, Standard or SurePass
- 880 exam-style questions, every one with a written explanation
- Every flashcard deck on spaced repetition — what you miss comes back sooner
- A readiness score that tells you when you're actually ready to sit
- Works offline — study anywhere, no signal needed


What’s inside your study portal
The full SPI Fast Track Study System.
One system, paced to your exam date. Every practice question, every flashcard deck, full-length mocks, narrated audio, Miles the AI tutor and the whole study guide — every pass opens all of it; Standard carries the Money-Back Guarantee and SurePass the SurePass Guarantee.
- Every practice question — Tutor, Timed and Quiz modes — and every flashcard deck
- Full-length mock exams, narrated audio on every chapter, and Miles, the AI tutor
- Your SPI cheat sheet — the highest-yield facts as a PDF, instant to download
- The whole study guide — every chapter, not a preview — as the depth behind the questions
- Your readiness meter and study plan, paced to your exam date, on every device
The Capital Prep Method
What to study, when to study it & the exact moment you're ready.
Cut out the months of studying you don't need. SPI prep that adapts every day — no guessing what to do next.
SurePass readiness
A readiness score built from your own answers — not a progress bar. It moves as you answer, and recent work counts most. On an exam scored 300–700, it is the only straight answer you get to "am I ready?"


Anywhere Mode · Study from your pocket
Ten minutes of scrolling — or ten minutes closer to passing.
Your phone is already in your hand. Two taps, no signal needed.
- Quick Ten — One tap. Ten questions, with the rationale on every one.
- It downloads itself — No button, no setup, nothing to remember.
- No bars? Still works — Airplane mode, the subway, a cabin in the woods.
- Nothing gets lost. Ever. — Saves as you tap, syncs when you're back.
Flashcards and practice questions work offline. The study guide, audio and full-length mocks need a connection.

Flashcards that work offline
Before you decide how to study
Nearly 1 in 3fail the SPI exam
And of the candidates who came back to retake it that year, more than half failed again.
Source: ARDMS’s own published certification statistics (1 January – 31 December 2025).
That is exactly why we guarantee it.

Pass the SPI — or get your money back.
- Standard and SurePass: full refund if you don't pass — plus 90 more days of access on Standard, another year on SurePass, free.
- SurePass: we also pay your $275 ARDMS retake fee.
- Starter: no refund — don't pass, and you get 30 more days of access, free.
From $89 · Starter, Standard or SurePass
What you get with each SPI pass
Every pass includes the full study system. Only the length of access and the guarantee change.
Starter
7-day sprint
7 days of access
One-time payment
Less than the ARDMS retake fee ($275)
No money back — upload your score report and we add the days.
- Money back
- Retake fee paid
- 30 more days free if you don't pass
One payment · no subscription · secure checkout by Stripe
See all study materials included
Click any feature to see it.
Standard
A month of study
30 days of access
One-time payment
Less than the ARDMS retake fee ($275)
Don't pass? Full refund — and 90 more days of access, free.
- Money back
- Retake fee paid
- 90 more days free if you don't pass
One payment · no subscription · secure checkout by Stripe
See all study materials included
Click any feature to see it.
SurePass
The guarantee
1 year of access
One-time payment
Less than the ARDMS retake fee ($275)
Don't pass? Full refund, your $275 retake fee paid — and another year of access, free.
- Money back
- Retake fee paid
- Another year free if you don't pass
One payment · no subscription · secure checkout by Stripe
See all study materials included
Click any feature to see it.
- Instant access
- Full study system with every pass
Don't pass? Standard refunds you. SurePass also pays your retake fee. Terms apply
Questions before you choose? Ask an advisor →
SPI · Features and Pricing
How Capital Prep compares
Tap any i to learn more about a feature.
| Click an i to learn more | Capital Prep | Ultrasound Registry Review | Gulfcoast (GCUS) | Davies Publishing |
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Competitor prices read 26 Sep 2026 — check before you buy. Trademarks are their owners'; Capital Prep is not affiliated with or endorsed by ARDMS.
Worried about how you'll do on the SPI?
Talk to an advisor.
Ask about the guarantee, which pass fits, or how the study system works. We read every message and reply within a few hours.
We'll reply by email within a few hours.or chat with us now

Questions, answered
What's inside the study portal?
The full Fast Track Study System — every practice question, every flashcard deck, full-length mock exams, narrated audio, Miles the AI tutor, and the entire study guide, every chapter readable and highlightable. The cheat sheet — the highest-yield facts as a PDF — is in the study portal on every pass, with instant access to download it. Every pass opens all of it; Standard carries the Money-Back Guarantee and SurePass the SurePass Guarantee.
How does the SurePass Guarantee work?
Standard and SurePass carry it. Score 80%+ on one full-length mock, sit the real exam, and if you don't pass we refund what you paid. On SurePass, clear two mocks with your readiness meter at "Getting close" or above and we also pay your full $275 retake fee. A refund also comes with free access to keep preparing — 90 more days on Standard, another year on SurePass. Starter carries no refund — don't pass, upload your score report, and we add 30 more days of access, free. Every free period is counted from the earliest date your exam allows a retake. You file the claim in your study portal with your official score report.
How many full-length mocks do I get?
Four scored full-length sittings, each a brand-new 110-question paper built to the five published domains and timed to the real two hours. Practice questions and timed practice are unlimited and never use one. Form length is the sharper number here than the raw count: 110 questions in two hours is exactly what ARDMS administers, and the nearest competitor's practice exams run 120.
Which pass should I buy?
SurePass, for almost everyone: today it costs the same as Standard, it runs a full year, and it is the only pass that pays your retake fee if you don't pass (and adds another year free). Standard is a month of access with the Money-Back Guarantee — a refund plus 90 more days if you don't pass. Starter is one week of access with no refund — don't pass and you get 30 more days free.
What does the exam itself cost?
$275, paid to ARDMS, and a retake is the full $275 again — the fee schedule has no retake line for any ARDMS exam, and the retake guidelines say to "submit another online application and payment". There is also a 60-day wait before you can sit again. That is why SurePass covers your full $275 retake fee if you qualify and don't pass.
What is on the exam?
Approximately 110 multiple-choice questions in two hours. Five domains, and Doppler is the largest at 34%, then image optimization at 26%, performing examinations at 23%, clinical safety and quality assurance at 10%, and managing transducers at 7%.
What score do I need to pass?
ARDMS reports a scaled score between 300 and 700, and 555 passes. Scaled scoring means the number is not a percentage of questions correct, so nobody can honestly convert it into one — including us. The 80% our mocks score against is our own bar, stated as ours.
How many people fail the SPI?
ARDMS publishes this itself, per exam, per year. In 2025, 68% of SPI candidates passed — so nearly one in three did not. The number that matters more if you have already sat it: of candidates who went back and retook the SPI that year, 53% failed again. That is the whole reason the retake-fee cover exists.
What about ARDMS's own practice test?
ARDMS sells one, in two versions it calls equivalent in difficulty, at $50 each: 30 questions in 30 minutes, one session, on the real test-centre interface. Its report tells you how many you got right and not which ones. ARDMS's own instruction is to "use the results as an indicator of your knowledge — not as a predictor of your actual exam score". It is worth $50 for interface familiarity, and it is not the 110-item rehearsal it says itself it is not.
Am I eligible to sit the SPI?
Eligibility runs through one of ARDMS's prerequisite paths, which depend on your education and clinical experience, and the SPI is normally taken alongside a specialty exam. Check ARDMS's current prerequisites on inteleos.org before you apply.
What happens when my pass expires?
Your account stays; the paid features stop. Your notes, highlights and flashcard history are all still there if you come back, and SurePass runs a full year — and adds another year free if you don't pass.
Are the questions like the real exam?
Every item is written to the published content outline, weighted domain by domain, with four options and a rationale on each. Every key was recomputed from its own stem before the explanation was read. On this bank we also publish what the audit found: a blind reader who knew no sonography scored 25.2% against a 25.0% chance floor, which is as close to no leak as the measurement can show.
My exam date moved. Does the plan adjust?
Yes. Change the date and the Game Plan rebuilds around the new one — it works backwards from your date, so a move forward compresses it and a move back spreads it out. Nothing is lost.
Can I use it on my phone, and does it work offline?
Yes to both. Add it to your home screen and it behaves like an app. Your due flashcards and a set of practice questions download automatically, so you can revise with no signal. The whole study guide downloads too, narrated audio included; scored mocks and the tutor still need a connection.
Do you offer refunds if I change my mind?
Yes, separately from the pass guarantee: 24 hours on Starter, 48 hours on Standard, or 72 hours on SurePass, measured from your purchase (or from your upgrade, if you upgraded) — no questions asked, as long as you haven't sat your exam yet. EEA and UK buyers also keep their 14-day statutory right. The SurePass Guarantee is the other promise — that one is about your exam result, not about changing your mind.
Why are SurePass guarantees limited?
Because we honor them. Every guarantee is a real financial commitment we may genuinely pay out, so a limited number opens for this exam each day. The allocation resets at midnight in your own time zone, and the counter shows how many of today's are still open.
Have questions or concerns?
A real person reads every message and replies by email.
Ready to start?
Standard and SurePass carry the SPI guarantee — SurePass pays your retake fee too. Pick yours and keep the whole system open.
From $89 · Starter, Standard or SurePass








