- The CBN exam has 175 questions (150 scored, 25 unscored pretest) in a 3-hour window at PSI centers.
- Perioperative and Follow-up are the two heaviest domains, each worth 25.3% (38 items apiece).
- Eligibility requires 2 years as an RN and 2,000 hours of obesity/bariatric nursing in the prior 4 years.
- In 2025, 41 of 65 examinees passed - verify your own readiness against the blueprint, not the average.
CBN Quick-Facts Snapshot
If you only have five minutes before your next study session, this is the page to bookmark. It condenses the entire CBN Certification credential - administered by the American Society for Metabolic and Bariatric Surgery (ASMBS) through its CBN Certification Council - into the numbers, deadlines, and domain weights that actually show up on test day. For a deeper walk-through of any single item below, jump to the linked articles; this page is designed for rapid recall, not first-time learning.
Who Administers the CBN Exam
The credential is owned by ASMBS's CBN Certification Council, and the actual test-day experience happens at PSI assessment centers. The exam is offered in English only. If any of that sounds unfamiliar, it's worth double-checking your source material - other credentials share the "CBN" acronym, and outdated or mismatched content occasionally circulates online. Everything on this page applies exclusively to the Certified Bariatric Nurse credential defined in the 2025-2026 Candidate Handbook (revision dated May 28, 2026), with a blueprint built from the 2022 practice analysis.
- Certifying body: ASMBS CBN Certification Council
- Test delivery: PSI assessment centers
- Language: English
- Governing document: 2025-2026 Candidate Handbook
Exam Format at a Glance
The CBN exam is 175 four-option, single-best-answer multiple-choice questions delivered in a 3-hour appointment. Of those, 150 items are scored and 25 are unidentified, unscored pretest items - you won't know which is which, so every question deserves full attention. Scoring uses a criterion-referenced standard with statistical equating, every scored item carries equal weight, and there is no penalty for guessing. That last point matters: leaving a question blank costs you certainty for nothing, so answer everything even under time pressure.
Key Takeaway
Because 25 unscored pretest items are mixed in invisibly, treat all 175 questions as if they count. Don't waste mental energy trying to guess which ones are "real."
Logistics that trip people up on test day:
- The exam is closed-book - no reference materials.
- Calculators are prohibited, even for dosage-style calculation questions.
- You need 2 forms of identification to check in.
- Any breaks you take are deducted from your total exam time, so budget bathroom breaks accordingly.
For a full breakdown of how this format compares to nursing boards and other certifications, see How Hard Is the CBN Exam? Complete Difficulty Guide 2026.
The 5 Domains and Their Weights
The blueprint splits the 150 scored items across five clinical and professional domains. Perioperative and Follow-up are jointly the largest, each carrying 25.3% of the exam - together they represent half your scored questions, so they deserve the largest share of your study hours.
| Domain | Weight | Scored Items |
|---|---|---|
| 1. Clinical Management: Preoperative (Pre-hospital) | 21.3% | 32 |
| 2. Clinical Management: Perioperative (Hospital) | 25.3% | 38 |
| 3. Clinical Management: Follow-up (Post-discharge & longer term) | 25.3% | 38 |
| 4. Professional and Community Collaboration | 14.7% | 22 |
| 5. Program Quality | 13.3% | 20 |
The rounded published percentages sum to 99.9%, which is normal for rounding across five categories - don't lose sleep over the missing tenth of a percent.
Domain 2 & 3 Priority: Perioperative and Follow-up
These two domains combine for 76 of the 150 scored items. Candidates should be fluent in:
- Immediate post-op complication recognition (leaks, DVT/PE, dehydration)
- Bariatric-specific discharge teaching and long-term nutritional monitoring
- Late complications tied to specific procedure types and years post-surgery
Domain 4 (Professional and Community Collaboration) and Domain 5 (Program Quality) carry less weight individually but are frequently underprepared for because they feel less "clinical." For an item-by-item breakdown of every domain's subtopics, read the CBN Exam Domains 2026: Complete Guide to All 5 Content Areas.
Eligibility Cheat Sheet
Before you register, confirm you meet every requirement - PSI and ASMBS will not seat a candidate who doesn't.
- Current, unencumbered RN license (or an approved international equivalent)
- At least 2 years practicing as an RN in good standing
- 2,000 hours of obesity and/or metabolic and bariatric surgery nursing practice within the previous 4 years
- Agreement to uphold the ASMBS Code of Ethics and the CBN Standards of Conduct
Full documentation requirements, acceptable practice settings, and how to log your hours are covered in CBN Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Fees Cheat Sheet
Fees vary by membership category and by whether you register during the early or regular window. All figures are in USD.
| Candidate Type | Early Fee | Regular Fee |
|---|---|---|
| ASMBS members | $250 | $300 |
| Qualifying IFSO members (non-US chapters) | $300 | $350 |
| Nonmembers | $350 | $400 |
Registering early is the simplest way to reduce cost. For the complete cost picture, including renewal pricing, see CBN Certification Cost 2026: Complete Pricing Breakdown.
Scoring and Passing
The CBN exam uses a criterion-referenced passing standard combined with statistical equating across test forms. Practically, that means the passing threshold is set by content experts against defined competencies, then statistically adjusted so every form is equally difficult - not a fixed "70% correct" cutoff, and not a curve against other candidates in your session. Every scored item is weighted equally, so there's no advantage to prioritizing questions you assume are "worth more." A full explanation of how the standard is set, and what score reports actually show, lives in CBN Passing Score 2026: Exactly What You Need to Pass.
2025 Results Snapshot
For historical trends, how results are reported, and what the numbers mean for your own study plan, see CBN Pass Rate 2026: What the Data Shows.
Renewal and Retest Rules
CBN certification is valid for 4 years. To renew, you need:
- A current, qualifying RN license
- 1,000 specialty practice hours within the previous 4 years
- Either re-examination, or 80 continuing-education/professional-development points within 48 months - at least 40 of those points must be specialty-specific CE contact hours
| Renewal Candidate Type | Early | Regular | Late |
|---|---|---|---|
| ASMBS/IFSO members | $250 | $350 | $450 |
| Nonmembers | $350 | $450 | $550 |
If you fail the exam, you must skip the next full testing window before retesting. You may request a one-time 25% discount on the retest fee, applicable to the first subsequent window in which you're eligible to retest again.
One-Page Study Reference
Rather than a generic weekly template, allocate study time roughly in proportion to domain weight - Perioperative and Follow-up first, since together they account for over half the scored questions.
Perioperative (Domain 2) & Follow-up (Domain 3)
- Post-op complication recognition and timelines
- Long-term nutritional deficiency monitoring and discharge teaching
Preoperative (Domain 1)
- Pre-surgical clearance, patient selection, and education
Professional & Community Collaboration (Domain 4) and Program Quality (Domain 5)
- Interdisciplinary team roles and accreditation/quality-improvement concepts
Full-length practice and review
- Timed 175-question simulations at CBN Exam Prep
- Review missed items by domain, not just by topic
For a complete, step-by-step preparation plan rather than this condensed version, read CBN Study Guide 2026: How to Pass on Your First Attempt.
Where CBNs Work
Bariatric surgery programs, accredited surgical weight-loss centers, and hospital metabolic/bariatric units are the typical employers seeking this credential, since the eligibility hours themselves are earned in obesity and metabolic/bariatric surgery nursing practice. If you're weighing whether the credential fits your career path, compare the investment against outcomes in Is the CBN Certification Worth It? Complete ROI Analysis 2026, review typical roles in CBN Jobs, and check earning expectations in CBN Salary Guide 2026: Complete Earnings Analysis.
Frequently Asked Questions
175 four-option multiple-choice questions - 150 scored and 25 unscored pretest items - in a 3-hour testing appointment at a PSI center.
Start with Perioperative (Hospital) and Follow-up (Post-discharge & longer term), since each is worth 25.3% and together they make up over half the scored questions.
No. Scoring is criterion-referenced with statistical equating, every scored item is weighted equally, and there is no guessing penalty, so answer every question.
You must skip the next full testing window before retesting, though a one-time 25% discount is available for the first window you're eligible to retest.
Four years. Renewal requires 1,000 specialty practice hours plus either re-examination or 80 CE/PD points (including 40 specialty-specific CE contact hours) within 48 months.