SPI · Sonography Principles & Instrumentation

Pass the SPI — or get every dollar back. Guaranteed.

Don't pass? Full refund — and Lifetime pays your $275 retake fee

Physics is the exam sonographers fail. Know exactly what to study and the moment you're ready to sit.

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From $59 · 7-day, 30-day or Lifetime

  • 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
The SPI study guide open in the reader on a phone
The SPI cheat sheet — cover

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, backed by 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?"

SurePass readiness — SPI

See what's included →

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.
Get your exam pass guarantee

Flashcards and practice questions work offline. The study guide, audio and full-length mocks need a connection.

SPI — flashcards that work offline, on a phone

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.

SurePass Guarantee

Pass the SPI — or get your money back.

  • Every pass: full refund — and you keep Lifetime access, free.
  • Lifetime (SurePass Pro): we also pay your $275 ARDMS retake fee.
Get your exam pass guarantee

From $59 · 7-day, 30-day or Lifetime

What you get with each SPI pass

Every pass includes the full study system. Only the length of access and the guarantee payout change.

Lowest price

7-Day Pass

Fall flash sale
$59$79

one-time · 7 days of access

Less than the ARDMS retake fee ($275)

Cram-ready full access for the final week before your exam.

Click any feature to see it.

SurePass Guarantee
  • Retake fee not covered
  • Full refund if you don't pass
  • Keep full access, free, until you do

One payment · no subscription · secure checkout by Stripe

Strong guarantee

30-Day Pass

Fall flash sale
$89$119

one-time · 30 days of access

Less than the ARDMS retake fee ($275)

A full month to prep — backed by our pass guarantee.

Click any feature to see it.

SurePass Guarantee
  • Retake fee not covered
  • Full refund if you don't pass
  • Keep full access, free, until you do

One payment · no subscription · secure checkout by Stripe

Most popular

Best guarantee

Lifetime

Fall flash sale
$149$199

one-time · never expires

Less than the ARDMS retake fee ($275)

Study at your pace, forever — backed by our pass guarantee.

Click any feature to see it.

SurePass Guarantee ProBest protection
  • We pay your $275 retake fee
  • Full refund if you don't pass
  • Lifetime access already included

One payment · no subscription · secure checkout by Stripe

  • Instant access
  • Full study system with every pass

Don't pass? Full refund. On Lifetime, your retake fee is covered too. 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.

How Capital Prep compares with Ultrasound Registry Review, Gulfcoast (GCUS), Davies Publishing
Click an i to learn moreCapital PrepUltrasound Registry ReviewGulfcoast (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?
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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, backed by the SurePass Guarantee.

How does the SurePass Guarantee work?

Score 80%+ on one full-length mock, sit the real exam, and if you don't pass we refund what you paid. On Lifetime, clear two mocks with your readiness meter at "Getting close" or above and we also pay your full $275 retake fee. 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?

Match it to your exam date. Sitting within a week, the 7-Day Pass is built for that. A month out, the 30-Day. No date yet — Lifetime, and on this exam that is a real category difference rather than a marketing line: every other SPI product in the market expires, most of them monthly.

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 our Lifetime tier 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 Lifetime never expires.

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 the 7-Day Pass, 48 hours on the 30-Day Pass, or 72 hours on Lifetime, 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.

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Every SPI pass carries the guarantee — pick yours and keep the whole system open.

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From $59 · 7-day, 30-day or Lifetime