Checked 29 September 2026. From Inteleos's 5-Year Rule, retake and scheduling pages, the SPI and FE exam pages, the Global Exam Performance Summary PDFs (2013–2025) and the SPI and FE content outlines v24.1. The 2027 FE windows were not published on 29 September 2026.
Nobody earns an ARDMS credential with the Fetal Echocardiography exam alone. FE is a specialty: "FE is a qualified specialty for RDCS and RDMS certification. The SPI exam is also required." Passing Sonography Principles and Instrumentation (SPI) and FE "within five years of each other, in any order" is the exam component of RDMS (FE) or RDCS (FE); you must also qualify under a prerequisite pathway and meet its documentation or completion conditions before the credential is awarded. This guide explains how the five years are really counted, who the rule does not apply to, and how to decide which exam to sit first, using ARDMS's own format and pass-rate figures. ProSyllabus is an independent study site. We are not affiliated with, or endorsed by, ARDMS or Inteleos; every rule below is quoted or summarised from their published pages, and ARDMS decides every application.
Inteleos 5-Year Rule page; SPI and FE exam pages.
How the 5-year rule actually counts
| Rule | ARDMS wording |
|---|---|
| What must happen | "All exams required for a certification — SPI and a specialty exam — must be taken and passed within 5 years of each other." |
| When the clock starts | "Takes effect the day after you pass your first exam." |
| How long it runs | "Based on the calendar year": pass on 6 June 2026 and you have until 31 December 2031. |
| If you miss it | "Retake the exam you've previously passed." |
| Who is exempt | "Does not apply to adding additional specialties to a certification you have already earned." |
| SPI once | "After passing the SPI exam once, you may earn additional ARDMS credentials. As long as you maintain active status, you do not need to retake SPI." |
Quoted from Inteleos's 5-Year Rule page and the FE exam page.
Three consequences follow. First, the window is longer than five years to the day: a June pass gets the rest of that year plus five full calendar years. Second, the exam you lose is the one you passed first, which might be FE, not SPI. Third, a sonographer who already holds RDMS (say, with Abdomen or OB/GYN) or RDCS (with Adult Echo) and adds FE is outside the rule entirely. ARDMS makes the no-SPI-retake promise conditional on keeping Active status, which means meeting every current Maintenance of Certification requirement — the annual attestation, renewal fee, continuing education and Knowledge Confirmation among them, per Inteleos's MOC pages — and then there is no SPI retake and no deadline.
Where other pages get this wrong
The 5-year rule makes you retake whichever exam you passed first, and it does not apply to existing RDMS or RDCS holders.
Commonly published instead: A lapse "means retaking SPI rather than simply resitting the specialty paper", with advice that everyone should check the date SPI was passed before committing.
ARDMS's rule is to "retake the exam you've previously passed" — FE, if FE came first — and the period runs to 31 December of the fifth calendar year. Someone already certified who adds FE as a new specialty has no five-year clock.
Your 5-year deadline for the second exam
Enter the date you passed your first exam (SPI or FE) and say whether you already hold RDMS or RDCS. The calculator applies ARDMS's calendar-year rule.
Our date arithmetic on ARDMS's rule and its own example (pass on 6 June 2026, deadline 31 December 2031). ARDMS gives no example for a pass on 31 December; check with ARDMS if yours falls on that day.
| First exam passed | Second exam by |
|---|---|
| 6 June 2026 (ARDMS's example; "June 6, 2026") | 31 December 2031 |
| 15 March 2026 | 31 December 2031 |
| 20 September 2026 | 31 December 2031 |
| 10 January 2027 | 31 December 2032 |
| Already RDMS or RDCS, adding FE | No deadline |
Our arithmetic on ARDMS's rule, for readers whose browser does not run the calculator.
SPI and FE side by side
| Feature | SPI | FE |
|---|---|---|
| What it tests | Physics and instrumentation for every ARDMS credential | Cardiographic principles as they apply to fetal patients |
| Questions and time | Approximately 110 in 2 hours | Approximately 145 in 3 hours |
| Item types | Multiple choice | Multiple choice and hotspot |
| When | Year-round | Two windows a year (2026: 3–26 March, 8 September – 1 October) |
| Result | Score report at the test centre; portal within a week | About 60 days after the window closes, then the following Monday |
| If you fail | Reapply after 3 days; retest after 60 days | Wait for the next administration |
| Fee | USD 275, including USD 100 non-refundable | USD 300, including USD 100 non-refundable |
| Outline version | v24.1 | v24.1 |
| Outside US, Canada, Mexico | + USD 50 per exam | + USD 50 per exam |
| Scale and pass | 300–700, pass 555 | 300–700, pass 555 |
| Weights | Perform exams 23%, transducers 7%, optimise images 26%, Doppler 34%, safety and QA 10% | History 7%, anatomy and physiology 25%, perform 34%, pathology 34% |
From the SPI and FE exam pages, the 2026 exam calendar, the fee schedule and both v24.1 content outlines. Fees include a non-refundable USD 100 processing fee.
The two retake rules look contradictory and are not. Inteleos's retake page (which lists FE) says you "must wait 60 days before you can retake the same exam" and may reapply after three days; the FE page says you "must wait until the next administration". In 2026 the two FE windows (3–26 March and 8 September – 1 October) were more than 60 days apart, so a March fail meant waiting for September. The 2027 windows were not published on 29 September 2026, so future gaps cannot be stated. For planning on the 2026 pattern: fail SPI and you can be back in about two months; fail FE and you wait for the next published window.
What ARDMS's pass rates say about the order
Official figures. 2013–2021 from the exam pages, which match Inteleos's Global Exam Performance Summary PDFs (2017 appears on the exam pages only); 2022–2025 from the Performance Summary PDFs, because the exam pages print different 2022 and 2023 figures (listed below).
| Year | SPI first-time | SPI overall | FE first-time | FE overall | Higher first-time rate |
|---|---|---|---|---|---|
| 2013 | 81% | 72% | 75% | 72% | SPI |
| 2014 | 79% | 71% | 78% | 74% | SPI |
| 2015 | 83% | 72% | 75% | 69% | SPI |
| 2016 | 78% | 70% | 79% | 73% | FE |
| 2017 | 75% | 67% | 76% | 67% | FE |
| 2018 | 73% | 65% | 65% | 59% | SPI |
| 2019 | 73% | 65% | 77% | 70% | FE |
| 2020 | 76% | 68% | 76% | 73% | equal |
| 2021 | 68% | 60% | 76% | 70% | FE |
| 2022 | 71% | 63% | 75% | 71% | FE |
| 2023 | 71% | 61% | 81% | 76% | FE |
| 2024 | 71% | 64% | 77% | 71% | FE |
| 2025 | 74% | 68% | 75% | 68% | FE |
Official rates; the last column is our comparison. Across 2013–2025, SPI's first-time rate was lower than FE's in 8 years (2016, 2017, 2019, 2021, 2022, 2023, 2024, 2025), equal in 1 (2020) and higher in 4 (2013, 2014, 2015, 2018). Since 2019 SPI has not beaten FE on first-time rate. The 2025 Performance Summary also gives repeat-taker rates: FE 41%, SPI 47%.
Where Inteleos's own figures disagree
| Year | Exam | Exam page | Performance Summary PDF |
|---|---|---|---|
| 2022 | FE | 74 / 71 | 75 / 71 |
| 2022 | SPI | 70 / 63 | 71 / 63 |
| 2022 | PE | 78 / 71 | 79 / 71 |
| 2023 | FE | 82 / 89 | 81 / 76 |
| 2023 | SPI | 72 / 65 | 71 / 61 |
| 2023 | OB/GYN | 79 / 74 | 78 / 74 |
| 2023 | PE | 88 / 72 | 88 / 80 |
Both columns are official Inteleos publications and we cannot say which is right, so we print both. Our chart and table use the Performance Summary PDFs for 2022–2025. The exam page's 2023 FE overall figure (89%) is above its first-time figure; the Performance Summary gives 76%, so we draw nothing from the 89%.
Scale matters when reading these. The older summaries print candidate counts: in 2018, 7,642 first-time candidates took SPI against 349 for FE (10,289 and 477 in total); in 2015, 7,346 against 301; in 2014, 7,471 against 279. With a few hundred FE candidates a year, a swing of a few points is a handful of people. The 2019–2025 summaries print percentages only.
Pass rates describe different populations, so they do not prove SPI is "harder" for you. They do support a practical reading: physics trips up a meaningful share of candidates, and SPI has the more forgiving logistics. ARDMS says only "in any order"; in our view SPI first suits most people new to ARDMS — it runs year-round, the result comes at the centre, a fail costs two months, and a pass starts a clock long enough to fit several FE windows. SPI's largest domain is Doppler at 34%, which is also the backbone of FE's function and haemodynamics tasks, so the physics work is not wasted.
When FE first makes sense
| Your situation | Sensible order (our reading) |
|---|---|
| New to ARDMS, physics shaky | SPI first, then the next FE window you can prepare for |
| New to ARDMS, an FE window is close and your fetal echo work is daily | FE in that window, SPI any time afterwards within the five years |
| Already RDMS or RDCS | FE only; no SPI, no clock |
| SPI passed four or more years ago, not yet certified | Count the FE windows left before your 31 December deadline before anything else |
| Student on Pathway 3B | Qualifying students may apply up to one year before completion once the required clinical experience is done; plan both exams inside that |
| Student on Pathway 2 | The student paperless route lists AB, OB/GYN, AE and VT, not FE; plan FE for after graduation |
Our suggestions from ARDMS's rules; ARDMS itself says only "in any order".
One point is easy to miss: because FE is windowed, a late clock is tighter than it looks. In 2026 there were two FE windows, 3–26 March and 8 September – 1 October. If your SPI pass leaves you only one or two windows before 31 December of the fifth year, a single failed FE attempt can push you past the deadline. The 2027 windows had not been published on 29 September 2026; the 2026 pattern (applications from December for March, from June for September) is a pattern only, not an announcement.
Choosing RDMS or RDCS happens at the FE exam
FE is the only ARDMS specialty that counts toward both credentials: RDMS is SPI plus one of Abdomen, Breast, FE, OB/GYN or Pediatric Sonography, and RDCS is SPI plus one of Adult Echo, FE or Pediatric Echo. ARDMS says: "You must choose your certification when you take the exam. It cannot be switched." If you work in an echo lab or plan to add Adult or Pediatric Echo later, RDCS (FE) groups those together; if your base is obstetric and general sonography, RDMS (FE) sits beside OB/GYN. The comparison guide in this series covers that choice in detail.
Do I have to take SPI before the fetal echo exam?
No. ARDMS says you must pass both within five years of each other, in any order.
When does the ARDMS 5-year rule end?
On 31 December of the fifth calendar year after you pass your first exam. ARDMS's example: pass on 6 June 2026, deadline 31 December 2031.
Which exam do I retake if I miss the 5-year deadline?
The one you passed first, which could be FE rather than SPI.
I already have RDMS. Does the 5-year rule apply to FE?
No. ARDMS says the rule does not apply to adding additional specialties to a certification you have already earned.
How long is the SPI exam?
Approximately 110 multiple-choice questions in two hours, year-round, USD 275.
If I fail FE, when can I retake it?
At the next administration. In 2026 the two FE windows were more than 60 days apart; the 2027 windows were not published on 29 September 2026.
What is the SPI pass rate?
First-time 74% and overall 68% in 2025, from Inteleos's 2025 Global Exam Performance Summary (2024: 71% and 64%).
Is SPI harder than FE?
On Inteleos's figures SPI's first-time pass rate was lower than FE's in 8 of the 13 years from 2013 to 2025, equal in 1 and higher in 4 (our count). The populations differ in size and background, so it is not a direct difficulty comparison.
Can I switch from RDMS (FE) to RDCS (FE) later?
No. ARDMS says you choose the certification when you take the FE exam and it cannot be switched.
Are 2027 FE dates out?
Not on 29 September 2026. ARDMS's calendar covers 2026 only.
Sources
- official — Inteleos — 5-Year Rule
- official — Inteleos / ARDMS — Fetal Echocardiography (FE) exam page (windows, fee, format, scoring, pass rates)
- official — Inteleos / ARDMS — Sonography Principles and Instrumentation (SPI) exam page
- official — Inteleos — Exam Statistics page and Global Exam Performance Summary reports, 2013–2025 (PDFs)
- official — ARDMS — SPI Examination Content Outline v24.1 (PDF)
- official — ARDMS — Fetal Echocardiography Examination Content Outline v24.1 (PDF)
- official — Inteleos — Retake and reapply guidelines
- official — Inteleos — Exam Calendar 2026 (PDF)
- official — Inteleos — Exam Fee Schedule (PDF)
- official — Inteleos — Registered Diagnostic Cardiac Sonographer (RDCS)
- official — Inteleos — Registered Diagnostic Medical Sonographer (RDMS)
- official — Inteleos — Notification of Results and Scoring
- official — Inteleos — Maintenance of Certification overview
- official — Inteleos — Annual Attestation
- official — Inteleos — Knowledge Confirmation
- official — ARDMS — SPI Requirement & Specialty Examination Prerequisites, Final 08-2026 (PDF)
- official — Inteleos — Paperless Applications for Students (AB, OB/GYN, AE, VT; on-demand exams only)
official = a document published by the conducting body. reported = a news or coaching site we could not check against an original. Where sources disagree this page says so rather than picking one.
