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CEN Exam Blueprint: Content Areas, Percentages, How to Study

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The CEN exam blueprint (BCEN's content outline, effective July 6, 2026) spreads 150 scored questions across 11 content areas, from cardiovascular emergencies at 18 questions (12%) down to HEENT and the GU, gynecology and obstetrics area at 10 each (about 7%). No single area is more than an eighth of the exam, so the CEN rewards broad coverage more than deep study of one system.

This post lists every area with its item count and percentage, explains what changed from the 2022 outline, and turns the numbers into a study order. The full CEN exam guide, linked at the end, covers eligibility, fees and test day.

CEN exam blueprint: the 11 content areas

BCEN publishes the outline as item counts out of the 150 scored questions. The percentages below are those counts divided by 150.

BCEN CEN content outline effective July 6, 2026, and the January 2022 outline.
Content areaScored itemsShare2022 outline
Cardiovascular1812.0%19
Respiratory1711.3%18
Neurological1711.3%18
Medical1510.0%14
Gastrointestinal149.3%Shared an area with GU, GYN, OB
Mental Health138.7%11
Environment, Toxicology, Communicable Diseases138.7%14
Professional Issues128.0%14
Musculoskeletal and Wound117.3%13
Genitourinary, Gynecology, Obstetrics106.7%Shared with GI
Head, Eye, Ear, Nose, Throat (HEENT)106.7%11 (Maxillofacial and Ocular)

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CEN exam format

  • 175 questions: 150 scored and 25 unscored pretest questions. BCEN does not say which are pretest.
  • 180 minutes of seat time. There are also 5 practice questions to learn the software.
  • Passing score: 99 of the 150 scored questions, effective July 6, 2026. It is a raw score, not curved.
  • Unlimited attempts, with 90 days between tries.

With 175 questions in 180 minutes you have just over a minute per question. Answer every one, because a wrong guess costs nothing.

What changed from the 2022 outline

BCEN rebuilt the outline from a 2025 role delineation study, a survey of emergency nurses in urban, rural, pediatric and mixed emergency departments. A new passing point study, using the Angoff method, set the 99-question cut score.

  • Gastrointestinal is now its own area (14 questions). It used to share an area with genitourinary, gynecology and obstetrics.
  • Maxillofacial and Ocular became HEENT, a broader area covering ears, nose and throat as well.
  • Professional Issues now has two parts: prioritization (triage, mass casualty and patient throughput) and legal and ethical issues. It dropped from 14 to 12 questions.
  • Mental Health grew from 11 to 13 and Medical from 14 to 15. Cardiovascular, respiratory and neurological each lost one question.

How to study by the CEN content areas

Because the areas are close in size, the order you study them in matters less than making sure none is left out. A practical plan:

  1. Take a baseline practice exam and note your score in each of the 11 areas.
  2. Start with the big three (cardiovascular, respiratory, neurological). Together they are 52 questions, about 35% of the exam.
  3. Next, the middle group: medical, GI, mental health and environment and toxicology, 55 questions together.
  4. Then the smaller areas: professional issues, musculoskeletal and wound, GU and OB, and HEENT. They are 43 questions, almost 30% of the exam, so do not leave them for the last few days.
  5. For each body system, cover adult, pediatric and trauma presentations together, since that is how the outline groups them.
  6. Move any area where your baseline is low up the list, whatever its size.

Sample questions: triage in Professional Issues

These two come from the Professional Issues section of the ICU Basics CEN bank. Both test the prioritization part of the new outline.

Question 1 · Professional Issues

Four adults arrive at triage within a few minutes of each other. Which patient meets ESI level 2 criteria?

  1. A 31-year-old with a 3-cm forearm laceration, bleeding controlled
  2. A 40-year-old with a known seizure disorder, alert and oriented after a seizure at home
  3. A 62-year-old with chronic low back pain rated 8/10, unchanged from his usual pain, walking without difficulty
  4. A 55-year-old kidney transplant recipient with a cough and T 38.4 °C
Show the answer and rationale

Answer: D

  • A. Bleeding sounds urgent, but controlled bleeding from a simple laceration needs one resource, the repair, which makes this ESI 4 if vital signs are normal.
  • B. A post-ictal patient would be ESI 2 for altered mental status, but v5 levels a known seizure patient who is alert and oriented by physiology and resources.
  • C. A rating of 7/10 or more means the nurse considers level 2; chronic pain that is at baseline with no systemic cause is leveled by predicted resources instead.
  • D. Correct. A transplant recipient with fever or another sign of infection or rejection is a named ESI v5 high-risk situation because immunosuppression lets infection progress quickly.

Decision point B finds patients whose condition could easily deteriorate or who need time-sensitive treatment for a threat to life, limb, sight or organ. ESI v5 names a solid organ transplant recipient with fever or other signs of infection or rejection as level 2 because of the immunocompromised state, and adds that patients on a transplant list are usually high risk too. The other three are common traps: a pain score of 7/10 or more prompts the nurse to consider level 2 rather than assign it, a known seizure patient who is alert and oriented is leveled by physiology and resources, and a controlled laceration is counted at point C.

Sources: ENA ESI Handbook, 5th ed.

Question 2 · Professional Issues

A 50-year-old triaged as ESI 3 for nausea and upper abdominal pain has been in the waiting room for 40 minutes. She comes back to the triage desk saying she now has chest pressure and is sweating. Which action is BEST?

  1. Repeat her vital signs and raise her level if they cross the high-risk limits
  2. Obtain an ECG at triage and raise her level if the provider reads it as abnormal
  3. Raise her to ESI 2, arrange placement for an ECG now and document the change in condition
  4. Keep her at ESI 3, since a level stays as assigned, and send her for an ECG
Show the answer and rationale

Answer: C

  • A. Vital signs are checked at point D for stable patients, but new chest pressure with diaphoresis is already a point B finding that does not depend on the numbers.
  • B. An abnormal ECG would confirm level 2, but the presentation itself is suspicious for acute coronary syndrome, so waiting for the reading delays placement.
  • C. Correct. A change in condition before placement allows an upward change in level, and chest pressure suspicious for acute coronary syndrome is a high-risk ESI 2 situation.
  • D. ESI v5 does say an assigned level is not changed, but it makes an exception when the patient's condition changes before placement from the waiting area.

ESI v5 allows the triage nurse to change a level when the patient's condition changes before placement from the waiting area, and the only change it permits is an increase, because the patient may now be the highest priority in the department. The record must show the change in condition, the reason for the new level and the nurse's resulting action. Active chest pain suspicious for acute coronary syndrome is one of v5's high-risk examples at point B, so the suspicion alone meets level 2, and v5 sets a goal of an ECG within 10 minutes for chest pain. v5 also notes that cardiac events may present with nausea, vomiting, fatigue or weakness rather than classic chest pain, and asks nurses to pay close attention to female patients.

Sources: ENA ESI Handbook, 5th ed.

Walk-through for the first question: ESI level 2 is for patients who are high risk, confused or lethargic, or in severe distress. Ask which patient could get worse quickly. A transplant recipient with a fever is immunosuppressed, so an infection can progress fast, and the ESI handbook treats that as high risk. Chronic pain at its usual level, a seizure patient back to baseline and a controlled laceration are all stable.

Walk-through for the second question: a triage level is not fixed. When a waiting patient's condition changes, the nurse reassesses and can raise the level. New chest pressure with sweating is a high-risk presentation for acute coronary syndrome, so the patient becomes level 2 right away and needs an ECG now. Waiting for new vital signs or a provider's reading of the ECG delays care.

Frequently asked questions

How many questions are on the CEN exam?

The CEN has 175 questions: 150 scored and 25 unscored pretest questions, with 180 minutes of seat time.

What is the passing score for the CEN?

From July 6, 2026, you need 99 of the 150 scored questions. BCEN says the score is not curved.

What is the biggest section of the CEN exam?

Cardiovascular, with 18 of 150 scored questions (12%). Respiratory and neurological follow at 17 each.

Is trauma a separate section on the CEN?

No. The outline has no trauma area; injuries are tested within each body system and in musculoskeletal and wound.

How many times can you take the CEN?

BCEN allows unlimited attempts, with at least 90 days between them.

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Sources

  1. Malinovska A, Pitasch L, Geigy N, Nickel CH, Bingisser R. Modification of the Emergency Severity Index improves mortality prediction in older patients. West J Emerg Med. 2019;20(4):633-640. Link
  2. BCEN. Evolving Excellence: Updating the CEN Exam (blog). Link
  3. BCEN. CEN Frequently Asked Questions. Link
  4. BCEN. About the CEN Exam. Link
  5. BCEN. CEN: Study and Prepare. Link
  6. Emergency Nurses Association. ENA updates Emergency Severity Index resources to improve patient triage. Link
  7. Emergency Nurses Association. Emergency Severity Index (ESI) Handbook, 5th ed. (triage portfolio). Link