- What the Five OB-E Domains Actually Are
- Domain Weighting at a Glance
- Domain 1: Fetal Biometry, Cardiac Activity, and Dating (35%)
- Domain 2: Fetal Position/Presentation (20%)
- Domain 3: Placental Evaluation (15%)
- Domain 4: Amniotic Fluid Assessment (15%)
- Domain 5: Fetal Well-being and Overall Impression (15%)
- Peer Evaluation Criteria Are Not Domains
- Sequencing Your Preparation by Domain
- Registration, Timing, and Retake Mechanics That Shape Your Plan
- Frequently Asked Questions
- The OB-E outline has exactly five weighted domains totaling 100%, and Fetal Biometry, Cardiac Activity, and Dating carries the largest share at 35%.
- Fetal Position/Presentation is the second-largest domain at 20%; the remaining three domains are each 15%.
- Peer evaluation criteria like Gain, Depth, and Views are scored separately and are not additional content domains.
- You need 25 attested obstetric POCUS cases across all three trimesters within the preceding two years to be eligible.
What the Five OB-E Domains Actually Are
POCUS - Obstetrics Essentials (OB-E) is a content-specific certification offered by the Point-of-Care Ultrasound Certification Academy, part of Inteleos, and delivered online through myPOCUS. Unlike a traditional multiple-choice licensing exam, the assessment is built around clinical image and video cases, paired with a separate peer evaluation of your hands-on imaging skills.
The five domains are weighted clinical-case assessment objectives taken from the issuer-linked, undated one-page Obstetrics Essentials content outline. They describe what the cases test, not a course curriculum you are expected to sit through. That distinction matters: the outline tells you where scoring emphasis falls, and it is your job to arrive with the scanning experience to interpret the cases.
If you are still orienting yourself to the credential itself, start with What Is OB-E Certification? and then return here for the content breakdown. For the eligibility mechanics that come before any of this, see OB-E Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Domain Weighting at a Glance
| Domain | Name | Weight |
|---|---|---|
| 1 | Fetal Biometry, Cardiac Activity, and Dating | 35% |
| 2 | Fetal Position/Presentation | 20% |
| 3 | Placental Evaluation | 15% |
| 4 | Amniotic Fluid Assessment | 15% |
| 5 | Fetal Well-being and Overall Impression | 15% |
Domain 1: Fetal Biometry, Cardiac Activity, and Dating (35%)
More than a third of the clinical-case assessment objectives sit here, which makes this the single most consequential domain. It bundles three related skills that obstetric POCUS users perform constantly: measuring the fetus, confirming that the heart is beating, and using those findings to establish gestational age.
Fetal Biometry
Candidates must recognize correct measurement planes and caliper placement, and distinguish a well-obtained measurement from a flawed one.
- Know which standard views anchor each commonly used biometric measurement and what landmarks should be visible in each.
- Be able to spot a measurement taken in an oblique or off-axis plane, since the case images may not be textbook-perfect.
- Understand how trimester changes which measurements are practical and reliable.
Cardiac Activity
Confirming presence or absence of cardiac activity is a core point-of-care question, particularly early in pregnancy.
- Recognize how cardiac activity is documented on a clip, including appropriate use of M-mode when applicable.
- Understand why gain and depth settings can make a flickering heart easy or hard to appreciate.
- Be comfortable describing what you see rather than over-calling a finding the image cannot support.
Dating
Dating ties biometry to a gestational age estimate, and the cases reward understanding of how the measurements feed that estimate.
- Connect the appropriate measurement to the stage of pregnancy being imaged.
- Recognize when a single measurement should be interpreted cautiously.
- Appreciate the limits of point-of-care dating compared with a comprehensive formal study.
Because this domain spans all three trimesters of practice, your 25 attested cases should deliberately include early-pregnancy scans, not only third-trimester presentation checks. Candidates who log only late-pregnancy cases often feel underprepared here. For a sense of how this weighting affects overall difficulty, see How Hard Is the OB-E Exam? Complete Difficulty Guide 2026.
Domain 2: Fetal Position/Presentation (20%)
Position and presentation is the second-largest domain and, for many clinicians, the most intuitive. It is also the domain most closely tied to real bedside decisions, particularly in labor and delivery and in settings where formal imaging is not immediately available.
What Candidates Must Understand
You need to identify how the fetus is lying and what part is presenting, and to read that correctly from the image orientation you are given.
- Distinguish cephalic from breech presentations, and recognize transverse or oblique lie.
- Keep probe orientation and screen orientation straight; a left-right or head-foot mix-up is the classic error in this domain.
- Use anatomic landmarks to confirm which end of the fetus you are looking at rather than guessing from overall shape.
- Appreciate that presentation can change earlier in gestation and is most clinically meaningful later in pregnancy.
The Views criterion in the peer evaluation overlaps naturally with this domain, because acquiring a clean, orientable image is half the battle. We cover how those criteria are scored separately below.
Domain 3: Placental Evaluation (15%)
Placental assessment is a focused point-of-care task: where is the placenta, and does anything about it look concerning? The domain carries 15% of the weighted objectives.
Core Placental Concepts
Cases in this domain test whether you can localize the placenta and recognize clinically important relationships.
- Identify placental location relative to the uterine landmarks and the cervical os.
- Recognize the appearance of a placenta that is low-lying or covering the os, and know why that finding changes management.
- Understand the limits of a transabdominal point-of-care view and when a finding warrants formal imaging.
- Know the typical appearance of normal placental tissue so that abnormal-looking areas stand out.
A practical note: the placenta is easy to over-interpret on a limited scan. Strong candidates articulate what the image does and does not establish, which mirrors the Decision Making criterion used by peer evaluators.
Domain 4: Amniotic Fluid Assessment (15%)
Amniotic fluid assessment is at its heart a semi-quantitative judgment: is there too little, a normal amount, or too much? The domain also carries 15%.
What the Cases Reward
Expect to demonstrate that you can obtain fluid measurements correctly and interpret them sensibly.
- Understand the common approaches to fluid assessment, including the single deepest pocket and the four-quadrant index, and when each is typically used.
- Recognize that proper technique, including keeping the probe perpendicular and avoiding cord and fetal parts within the measured pocket, determines whether a number is trustworthy.
- Use color Doppler appropriately when needed to confirm that a seemingly clear pocket is not occupied by umbilical cord.
- Link low and high fluid findings to the clinical situations in which they commonly matter.
Domain 5: Fetal Well-being and Overall Impression (15%)
The final domain pulls the pieces together. It asks whether you can step back from individual structures and form a coherent impression of the scan as a whole, including a sense of fetal well-being.
Synthesizing the Scan
This domain rewards integration rather than isolated recall.
- Combine cardiac activity, fluid, placental, and presentation findings into a single, defensible overall impression.
- Recognize signs that point toward reassurance versus findings that should prompt escalation or formal evaluation.
- Understand that point-of-care obstetric ultrasound answers focused questions and does not replace a comprehensive anatomic survey.
- Communicate findings in terms of what was seen and what the clinical next step should be.
Candidates sometimes treat this as the "soft" domain, but it is where sound clinical judgment shows. It also bleeds into the other four, since a case labelled for one domain may require you to reason across several.
Peer Evaluation Criteria Are Not Domains
One of the most common sources of confusion is mixing up the five content domains with the criteria used by peer evaluators. They are separate things. The domains describe the weighted clinical-case assessment objectives. The peer evaluation, by contrast, uses equally weighted criteria that assess how you actually scan.
| Peer Criterion | What It Reflects |
|---|---|
| Diagnostic Quality | Whether your images are good enough to answer the clinical question |
| Gain | Appropriate brightness settings that neither wash out nor hide structures |
| Views | Obtaining the correct standard planes and orientation |
| Measurement | Accurate caliper placement and technique |
| Decision Making | Sound interpretation and next-step reasoning |
| Depth | Appropriate depth setting to include the target structure |
| M-Mode and Color Doppler | Correct use of these modes when applicable |
Peer evaluators are clinicians with a clinical ultrasound background who know your content-specific imaging abilities, and you must supply at least two. The first two anonymous questionnaires received determine the peer-assessment result, so choose evaluators who have genuinely watched you scan obstetric patients. To pass, you must meet all required components, which is explained further in OB-E Passing Score 2026: Exactly What You Need to Pass.
Sequencing Your Preparation by Domain
The weights suggest an order of attack. Because Domain 1 is worth 35%, it deserves the earliest and longest block of attention, and its skills (measurement technique, M-mode, early-pregnancy imaging) also feed directly into several peer criteria. A sensible progression looks like this:
Domain 1 first
- Review biometric planes, caliper technique, and documentation of cardiac activity with M-mode.
- Check that your logged cases include first-trimester scans, not only late-pregnancy ones.
Domain 2 next
- Drill orientation and landmark reasoning for presentation and lie.
- Practice reading cases where the screen orientation is deliberately unfamiliar.
Domains 3 and 4 together
- Pair placental localization with amniotic fluid technique, since both are pocket-and-landmark skills.
- Rehearse when color Doppler should be used to confirm a fluid pocket.
Domain 5 and full integration
- Work through whole-scan cases that require an overall impression.
- Brief your peer evaluators and confirm they can complete questionnaires promptly.
This is only an illustration of how the weights can guide scheduling; adjust it to your own scanning volume and case mix. For a broader plan, see the OB-E Study Guide 2026: How to Pass on Your First Attempt, and keep the OB-E Cheat Sheet 2026: One-Page Review of Must-Know Facts handy for last-pass review. You can also reinforce image-recognition skills with practice questions on the main practice test site.
Registration, Timing, and Retake Mechanics That Shape Your Plan
Domain knowledge is only part of the picture. The structure of the assessment affects how you should schedule your effort.
- Prerequisite: POCUS Fundamentals (or a waiver, such as a passed SPI within five years or a current ARDMS/APCA credential) is required. Fundamentals costs $125 unless waived.
- Fee: The standard OB-E fee is $150 USD, with eligible-country reductions and group pricing available. A full breakdown lives in OB-E Certification Cost 2026: Complete Pricing Breakdown.
- Case requirement: You attest to performing and participating in 25 obstetric POCUS cases across the three trimesters within the preceding two years.
- Time window: Complete the clinical assessment and peer evaluation within 90 days of registration. The online work can be stopped and resumed.
- Pacing guidance: The issuer's FAQ suggests planning roughly 20-30 minutes per case, which is planning guidance rather than an exam time limit.
- Format note: The issuer describes a seven-question media template without diagnostic requirements, but no assessment-wide question total or fixed examination timer was verified in the public sources.
Once certified, the credential is valid for five years. Renewal involves an active-practice and good-standing attestation, the relevant knowledge check, and a $50 fee, and it can begin six months before expiration. Scheduling specifics are covered in OB-E Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Key Takeaway
Match your effort to the weights, but do not neglect the peer evaluation. A strong Domain 1 performance means little if your evaluators have not seen you scan obstetric patients. Confirm both tracks early, since the 90-day window covers the clinical assessment and the peer evaluation together.
Frequently Asked Questions
Five. They are Fetal Biometry, Cardiac Activity, and Dating (35%); Fetal Position/Presentation (20%); Placental Evaluation (15%); Amniotic Fluid Assessment (15%); and Fetal Well-being and Overall Impression (15%). Together they total 100%.
No. Diagnostic Quality, Gain, Views, Measurement, Decision Making, Depth, and M-Mode and Color Doppler are equally weighted peer evaluation criteria. They are not additional clinical-case assessment domains.
Fetal Biometry, Cardiac Activity, and Dating, because it is the largest at 35%. It also overlaps heavily with measurement and M-mode skills that peer evaluators look at directly.
No numerical passing mark or credential-specific pass rate was verified in the issuer sources retrieved. You must pass all required components, with scoring set by Inteleos Psychometric Services and the PCA Council. See OB-E Pass Rate 2026: What the Data Shows for context.
No. This guide covers POCUS - Obstetrics Essentials (OB-E) from the Point-of-Care Ultrasound Certification Academy only, not NCC C-OBE, ARDMS OB/GYN, or the CP-MFH specialty. For definitions, see What Is OB-E? and for career context, Is the OB-E Certification Worth It? Complete ROI Analysis 2026.