- What This Cheat Sheet Covers (and What It Doesn't)
- Exam Format at a Glance
- The Five-Domain Map
- Assessment: Must-Know Facts
- Intervention and Treatment: Must-Know Facts
- Care Planning, Education and Referral: Must-Know Facts
- Numbers You Can Memorize, and Numbers You Cannot
- Credentials You Must Not Confuse with COCN
- Scheduling Your Review by Domain
- Frequently Asked Questions
- The exam has 120 multiple-choice questions: 110 scored plus 10 unidentified pretest items, in 120 minutes, administered by PSI.
- Scored items by domain: Assessment 27, Intervention 24, Treatment 23, Education and Referral 22, Care Planning 14.
- Assessment's percentage cell is blank in the official outline, so never invent a figure for it.
- No fixed raw passing count is published; the required number correct can vary by exam form.
What This Cheat Sheet Covers (and What It Doesn't)
This page condenses the verified facts about the Certified Ostomy Care Nurse (COCN) credential, issued by the Wound, Ostomy, and Continence Nursing Certification Board (WOCNCB), into a single reference you can reread the night before a study session or the week before your test date. It is built from the official WOCNCB COCN detailed content outline (titled "WOCNCB COCN 2023 DETAILED CONTENT OUTLINE," copyright 2024) and the January 2026 candidate handbook, which reproduces that outline on pages 26-30.
A note on dates: "2023" and "2024" are labels printed on source documents, not signs of a freshly revised 2026 blueprint. If you see a site claiming a "new 2026 COCN blueprint," treat it with suspicion. The outline you study from is the one the board links on its exam-content page.
This sheet is a memory aid, not a substitute for the full outline, for clinical experience, or for the eligibility rules that govern who may sit for the exam. For the long-form walkthrough, see our COCN study guide; for eligibility details, see COCN requirements. To test yourself against exam-style questions as you review, use the COCN practice tests.
Exam Format at a Glance
| Element | Verified Fact |
|---|---|
| Credential | Certified Ostomy Care Nurse (COCN), ostomy specialty |
| Certifying body | Wound, Ostomy, and Continence Nursing Certification Board (WOCNCB) |
| Test administrator | PSI |
| Delivery | Computerized, multiple-choice |
| Total questions | 120 |
| Scored questions | 110 |
| Unscored pretest questions | 10, unidentified (you cannot tell which they are) |
| Time allowed | 120 minutes |
| Credential validity | Five years |
| Cognitive levels tested | Recall, application and analysis (distribution not published) |
Because the stated cognitive levels include application and analysis, expect scenario-style stems rather than pure definitions. The exam rewards candidates who can look at a described stoma, peristomal skin condition, output pattern or patient situation and choose the most appropriate next action. How demanding that feels is covered in How Hard Is the COCN Exam?
The Five-Domain Map
The official outline allocates 110 scored items across five domains. Memorize the item counts; they tell you where your study hours earn the most return.
| Domain | Scored Items | Printed Domain Percentage |
|---|---|---|
| Assessment | 27 | Blank in the official PDFs (unspecified) |
| Intervention | 24 | 21.75% |
| Treatment | 23 | 21.25% |
| Care Planning | 14 | 12.49% |
| Education and Referral | 22 | 20.33% |
Assessment, Intervention and Treatment together account for 74 of the 110 scored items, so the bulk of your score rides on clinical judgment about the patient in front of you. Care Planning is the smallest domain at 14 items, but it is not skippable; at that size, a few missed items there can matter. For a domain-by-domain breakdown, see COCN Exam Domains: Complete Guide to All 5 Content Areas.
Assessment: Must-Know Facts
Domain 1: Assessment (27 scored items)
The largest domain by item count. Questions ask you to gather and interpret data about the patient, the ostomy or diversion, and the surrounding skin before choosing any action.
- Distinguish a healthy stoma from a compromised one by color, moisture, height and protrusion, and know which findings require urgent escalation rather than routine pouching changes.
- Identify the type of diversion described in a stem: ileostomy, colostomy, urostomy or a continent diversion, and the expected output for each.
- Recognize peristomal skin complications by appearance and likely cause: irritant contact dermatitis, allergic reaction, mechanical trauma, fungal involvement, and other causes.
- Recognize patient factors that change pouching and care decisions, including body contour, abdominal creases, mobility, dexterity, vision and psychosocial readiness.
- Assess fistulas, and percutaneous tubes and drains, including drainage character and site condition.
The pattern to internalize: Assessment questions usually ask what you should notice or determine first. When a stem presents a problem, the correct answer often identifies the cause or the missing data point before any product or procedure is selected.
Intervention and Treatment: Must-Know Facts
These two domains (24 and 23 scored items) are where assessment turns into action. The official outline distinguishes them, and so should you: Intervention is about what the nurse does in the care encounter and its associated procedures; Treatment is about managing identified problems and complications. Stems in either domain will often present a finding and ask for the best response.
Domain 2: Intervention (24 scored items)
Hands-on and procedural competence in ostomy and continent diversion care.
- Matching pouching systems and accessories to stoma and skin characteristics: flat versus convex, one-piece versus two-piece, barrier rings, paste, powders and other accessories, each with its purpose and limits.
- Appliance application and removal technique, fit, wear time reasoning and leakage troubleshooting.
- Procedures specific to continent diversions and to fistula, tube and drain management, performed within your competence, current evidence and applicable clinical protocols.
Domain 3: Treatment (23 scored items)
Managing problems once they are identified.
- Treating peristomal skin breakdown and matching the treatment to the underlying cause rather than to the appearance alone.
- Responding to stomal and peristomal complications and knowing when management exceeds nursing scope and needs referral or escalation.
- Managing output-related problems and the care needs of fistulas, tubes and drains.
Key Takeaway
On Intervention and Treatment items, resist the urge to pick the most elaborate option. Ask: what is the cause, what is the least invasive effective response, and does this situation need escalation beyond ostomy nursing? Items that differ only by product choice are usually settled by the cause identified in the stem.
Care Planning, Education and Referral: Must-Know Facts
Domain 4: Care Planning (14 scored items)
The smallest domain, but a place where careful reading pays off.
- Setting goals and priorities from assessment findings, patient preferences and realistic outcomes.
- Sequencing care across the perioperative and long-term continuum, including pre-surgical considerations and follow-up.
- Evaluating whether the plan is working and revising it when it is not.
Domain 5: Education and Referral (22 scored items)
Nearly as heavy as Intervention and Treatment, and often underestimated because it feels "soft."
- Teaching patients and caregivers self-care skills, and verifying understanding rather than assuming it.
- Adapting teaching to literacy, culture, cognition, physical ability and emotional readiness.
- Knowing when and to whom to refer: physicians, dietitians, social work, mental health, community and supply resources, and peer support.
- Preparing patients for life with an ostomy: diet, hydration, clothing, activity, intimacy, travel and supplies.
With 22 scored items, Education and Referral is worth almost as much as Treatment. Candidates who coast on clinical confidence and skip teaching and referral content give away points they could easily earn.
Numbers You Can Memorize, and Numbers You Cannot
Safe to memorize: 120 total questions; 110 scored; 10 unidentified pretest; 120 minutes; five-year credential validity; item counts of 27, 24, 23, 14 and 22 by domain.
Not published, so do not memorize anything from third-party sources:
- A fixed raw passing count. The issuer does not publish one, and the number correct required can vary by examination form. See our explainer on the COCN passing score for how to think about this.
- A verified passing percentage or scaled cut score. We could not verify a current figure, so we do not state one.
- A verified pass rate. Review what the data shows about the COCN pass rate for what can and cannot be said.
- The recall/application/analysis split. The levels are named, but the numerical distribution is not published here.
- Fees and testing dates. These change; confirm current figures with the issuer, and see COCN certification cost and COCN exam dates for how to approach them.
Credentials You Must Not Confuse with COCN
The WOCNCB offers several related credentials, and the acronyms look alike. Know what each is so you study the right outline:
| Credential | Relationship to COCN |
|---|---|
| COCN | Certified Ostomy Care Nurse: the ostomy specialty credential covered here |
| COCN-AP | A separate advanced-practice credential, not this exam |
| CWCN | Wound specialty credential |
| CCCN | Continence specialty credential |
| CFCN | Foot care specialty credential |
| WTA-C | Wound treatment associate credential |
| CWOCN | Combined wound, ostomy and continence credential |
The January 2026 handbook is shared across credentials, so it contains material for other specialties and for advanced practice. Do not treat that unrelated material as COCN test objectives. Your objectives are the tasks, knowledge and skill statements in the five-page COCN outline. If you need orientation on the name itself, see What Does COCN Stand For? and What Is COCN Certification?
Scheduling Your Review by Domain
The one place a schedule helps is in matching your calendar to the domain weights. Front-load the heavy, judgment-driven domains while you have the most time to practice them, and leave the smaller ones for reinforcement. Adjust the pacing to your own timeline and your work schedule.
Assessment (27 items)
- Stoma and peristomal skin characterization; diversion types and expected output.
- Fistula, tube and drain assessment vocabulary.
Intervention (24 items)
- Pouching systems, accessories and leakage troubleshooting.
- Continent diversion procedures and the limits of your competence.
Treatment (23 items)
- Cause-matched management of skin and stomal complications.
- Recognizing when escalation or referral is the answer.
Education and Referral (22 items), then Care Planning (14 items)
- Teaching strategies, readiness and referral pathways.
- Goal setting, sequencing and plan evaluation.
Mixed practice and review
- Timed mixed sets with the 120-minute limit in mind.
- Re-read this cheat sheet and the outline; revisit your weakest domain first.
For a deeper plan, read the COCN study guide, and use the practice tests to find which domain deserves your extra hours. If you are still weighing whether to pursue the credential at all, Is the COCN Certification Worth It? and the COCN salary guide discuss the career side, and COCN jobs looks at where the credential is put to use.
Frequently Asked Questions
The exam contains 120 computerized multiple-choice questions. Of these, 110 are scored and 10 are unidentified, non-scored pretest questions. You have 120 minutes, and PSI administers the examination.
The issuer does not publish a fixed raw passing count, and the number of correct answers required can vary by examination form. A current numerical passing percentage or scaled cut score was not verified, so avoid sources that state one with certainty. See the COCN passing score article for more.
Assessment has the most scored items at 27, followed by Intervention (24), Treatment (23), Education and Referral (22) and Care Planning (14). The official percentage cell for Assessment is blank, so rely on the item counts rather than a calculated percentage.
No. COCN is the Certified Ostomy Care Nurse credential for the ostomy specialty. COCN-AP is a separate advanced-practice credential, and CWOCN is the combined wound, ostomy and continence credential. Study from the COCN outline, not from material meant for other credentials.
Credentials are valid for five years. Eligibility and renewal requirements are set by the WOCNCB and are separate from exam preparation, so confirm the current rules with the issuer; see COCN requirements to start.
Keep this sheet alongside the official outline, treat every unpublished number as unknown, and let the domain item counts decide where your hours go. When you are ready to check your recall under realistic conditions, try the COCN practice tests.