What to Expect on the Emergency Medicine COMAT Exam
The Emergency Medicine COMAT is a 120-question, computer-based exam completed in 2.5 hours that assesses a DO student’s ability to apply clinical knowledge in emergency and acute care settings. The exam emphasizes rapid decision-making, triage, trauma and resuscitation principles, and identifying the most appropriate next step in management. Content spans a wide range of systems and patient presentations, with a strong focus on history and physical examination, diagnostic testing, and patient management. Effective preparation centers on question-based practice to build clinical reasoning, pacing, and familiarity with high-acuity scenarios.
The Emergency Medicine Comprehensive Osteopathic Medical Achievement Test (COMAT) is a standardized clinical subject exam taken at the end of an emergency medicine rotation for many osteopathic (DO) medical students. Created by the National Board of Osteopathic Medical Examiners (NBOME), the exam’s broad content, emergency scenarios, and triage-based questions are some of the few reasons students find this exam challenging. Nevertheless, we’re here to help you prepare to pass the COMAT.
What is the Emergency Medicine COMAT exam?
The Emergency Medicine (EM) COMAT is an end-of-rotation or end-of-course assessment for DO students. It tests their core knowledge and ability to apply osteopathic principles into emergency patient care, including emergency procedures and regulations, problem-solving, diagnostic testing, and more.
Emergency Medicine COMAT Exam Format and Structure
The COMAT Emergency Medicine shelf exam is computer-based and consists of 120 questions that must be completed within 2.5 hours. EM COMAT questions, or items, are multiple-choice and feature clinical vignettes for DO students to apply their emergency medical knowledge.
What topics are on the Emergency Medicine COMAT?
Topics on the exam are spread across two dimensions:
- Patient/Clinical Presentations
- Public Health and Special Populations (5-7%)
- Endocrine System and Metabolism (5-7%)
- Nervous System and Mental Health (8-12%)
- Musculoskeletal System (non-traumatic) (5-7%)
- Genitourinary/Renal System and Breast (8-12%)
- Gastrointestinal System and Nutritional Health (11-14%)
- Cardiovascular/Circulatory System (11-14%)
- Hematologic Systems, including Oncology (5-7%)
- Respiratory System (8-11%)
- Integumentary System (5-7%)
- HEENT (5-7%)
- Trauma (9-12%)
- Environmental, Toxicology, and Exposures (5-8%)
- Physician Tasks
- Health Promotion/Disease Prevention/Health Care Delivery (5-7%)
- History and Physical, including Diagnosis (25-35%)
- Diagnostic Technologies 25-35%
- Management 25-35%
Among these topics, DO students will be tested on:
- Chief complaints and undifferentiated patients
- Trauma and resuscitation principles
- Cardio, respiratory, neurologic, and toxicologic emergencies
- Risk stratification and disposition decisions
Why the Emergency Medicine COMAT Feels Challenging
Examinees often struggle with the broad scope of presentations they encounter on the exam. That, combined with the pressure of rapid decision-making between similar-seeming answer choices, can leave students feeling overwhelmed. With proper emergency medicine review, you’ll focus on identifying the patient’s stability and then determine the most logical next step.
Examinees should stay calm and recognize that each question on the exam tests their ability to provide safe, efficient patient care. The right study tools for the EM COMAT will both boost your confidence and help you pass.
How to Study Effectively for the Emergency Medicine COMAT
- Use practice questions: Practice questions help increase test-taking stamina and familiarize you with the content you’ll encounter on the exam.
- Review explanations to refine clinical reasoning: Understanding why a question is incorrect is key to retaining information long-term and applying it to real-life emergencies.
- Identify weak areas early and adjust study focus: If you’re struggling more in a specific area on the exam, such as trauma, practice questions can help you refine your expertise. Adjust your study plan to accommodate your weaknesses and master what you don’t know.
How Question-Based Practice Helps You Prepare
EM COMAT-style questions help students get familiar with exam pacing, so they don’t miss any questions due to timing constraints. Use a TrueLearn’s COMAT question bank to time yourself and reduce the duration you take to answer each question.
Furthermore, questions allow you to practice triage and patient prioritization. As you review COMAT questions more frequently, you’ll be able to recognize common emergency medicine presentations and how to prioritize patients based on their symptoms.
Sample Questions
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