What Is EM?

What Is EM (AOBEM Certification)?

On this site, EM refers specifically to Certification in Osteopathic Emergency Medicine administered by the American Osteopathic Board of Emergency Medicine (AOBEM). It is a two-stage board certification process for osteopathic emergency physicians, consisting of a Part I Written Exam and a separate Part II Oral Exam. This article focuses on the Part I Written Exam - the initial gateway exam - rather than the CORE continuing-certification assessment that comes later in a physician's career.

If you're researching this credential from scratch, our companion pieces on What Is EM Certification? and EM Meaning walk through the terminology in more depth, and EM Certification covers the full certification pathway end to end.

Exam Format and Delivery

The Part I Written Exam contains 300 multiple-choice questions, typically presented as one-best-answer items with five answer options. The exam is structured into six sections of 50 questions each, with 60 minutes allotted per section - six hours of active testing time in total.

• Optional 10-minute breaks are available between sections, and an optional 40-minute lunch break follows Section 3.
• Break time does not count against the six hours of active testing.
• Once a section closes, candidates cannot return to it - there is no reviewing earlier sections after moving on.
• Electronics and study materials are prohibited during breaks, so pacing and section-by-section decision-making matter more than cramming between sections.

Delivery is remotely proctored through AOA's MonitorEDU/PARADIGM arrangements. Candidates need a secure-browser setup completed in advance, a compatible computer plus a mobile device for proctoring, and a private, quiet testing space. Because there's no walking back into a closed section, many candidates find it useful to treat each 50-question block as its own mini-exam with its own pacing checkpoints - a strategy detailed further in our EM Study Guide 2026: How to Pass on Your First Attempt.

The 18 Written-Exam Domains

AOBEM's initial written-exam blueprint spans 18 content domains that together account for 100% of the exam. This is the initial-exam blueprint specifically - not the ABEM outline and not the CORE outline, which are distinct assessments with different governance and content. For a full domain-by-domain breakdown with study priorities, see EM Exam Domains 2026: Complete Guide to All 18 Content Areas.

Note that the two largest domains combined represent 18% of the exam - nearly one in five questions. Pairing these with Traumatic disorders means roughly a quarter of the exam draws from just three domains. This is the single most important prioritization insight for anyone building a study plan, and it's expanded further in How Hard Is the EM Exam? Complete Difficulty Guide 2026.

Eligibility and Timeline

Eligibility for the written exam requires completion of an approved emergency-medicine residency (or being far enough along in training), required licensing documentation, and professional/ethical compliance review. Specifically, the written exam can be taken once a candidate has completed at least 80% of residency training - meaning both graduates and final-year residents who meet this threshold can sit for it.

Notably, the written and oral exams may be taken in either order once each one's specific eligibility conditions are met, but residency must be fully complete before the oral exam can be attempted. Full board certification requires passing both exam stages plus AOA approval. Detailed eligibility documentation requirements are covered in EM Requirements 2026: Eligibility, Prerequisites & How to Qualify.

Fees, Scoring, and Dates

The Part I Written Exam fee is $1,100 USD. The separate Part II Oral Exam carries its own fee of $800 USD. A full cost breakdown, including how these fees fit into the broader certification budget, is available in EM Certification Cost 2026: Complete Pricing Breakdown.

Scoring uses a scaled range of 200 to 800, with a passing score of 500. This scaled approach means raw question counts don't map directly to pass/fail - a topic explored in EM Passing Score 2026: Exactly What You Need to Pass.

One published statistic worth understanding correctly: the commonly cited 93.63% pass rate is a five-year aggregate figure for first-time, board-eligible examinees - not a single-year snapshot. Treating it as an annual number can create misleading expectations. See EM Pass Rate 2026: What the Data Shows for the full context.

The next announced written exam window is March 22-24, 2027. For registration deadlines and how this date fits into the broader testing calendar, check EM Exam Dates 2026: Testing Windows, Deadlines & Scheduling.

Part II Oral Exam and Full Certification

Passing the written exam is only half of initial certification. The Part II Oral Exam ($800) tests clinical decision-making in a different format than multiple-choice questions, and residency training must be fully completed before a candidate can sit for it. Full certification in osteopathic emergency medicine is only granted after both the written and oral stages are passed and AOA has formally approved the certification.

Because the two exams can be sequenced flexibly around eligibility rules, some candidates choose to complete the written exam earlier in residency (once past the 80% training mark) and schedule the oral exam shortly after graduation.

Maintaining Certification: OCC and CORE

Certification doesn't end at Part II. Physicians maintain their status through Osteopathic Continuous Certification (OCC), which requires:

• Active licensure
• 60 CME credits per three-year cycle
• Participation in CORE (annual assessment component)
• Two practice-performance improvement projects per ten years - one in each five-year half

CORE replaces the older ten-year high-stakes recertification exam model; new certificants enter this annual pathway going forward. CORE consists of two required core modules plus four selected article modules, totaling 40-60 questions. Unlike the Part I Written Exam, CORE is open-book, requires 75% on each module, and allows two attempts separated by one week if a module isn't passed initially.

The annual OCC fee is $210, which includes CORE participation, with completion due by December 1 each year.

Who Recognizes and Hires for EM

AOBEM certification in emergency medicine is recognized by hospital credentialing committees, emergency department staffing groups, and health systems that employ osteopathically trained emergency physicians. Because full certification requires completed residency training plus both exam stages, it signals to employers that a physician has met a defined, board-verified competency standard across all 18 clinical domains - not just clinical rotations.

For physicians evaluating whether pursuing this credential (versus alternative certification pathways) makes sense for their career stage, our guides on EM Salary Guide 2026: Complete Earnings Analysis and Is the EM Certification Worth It? Complete ROI Analysis 2026 cover the practical employment and earnings angle. If you're still early in training and wondering how certification affects hiring, EM Jobs and EM Training address residency-to-practice transitions.

Building a Domain-Weighted Study Plan

Given that Abdominal/GI disorders, Cardiovascular disorders, and Traumatic disorders together make up roughly a quarter of the exam, an effective study calendar allocates disproportionate early time to these three domains before moving to mid-weight domains like Systemic infectious disorders, Nervous system disorders, and Thoracic-respiratory disorders (each 7%).

Simulating the actual section structure - 50 questions, 60 minutes, no going back - during practice is more valuable than generic full-length mock exams alone, since the real test locks sections permanently. Rotating through targeted question sets by domain weight, rather than studying alphabetically or by textbook chapter order, keeps effort proportional to exam impact. You can run timed, domain-specific practice sets on our practice test platform to rehearse this exact section-and-timing structure before test day.

For a distilled, single-page reference to keep nearby during final review, see the EM Cheat Sheet 2026: One-Page Review of Must-Know Facts, and for structured question practice ahead of exam day, explore EM Exam Prep's practice questions.

Frequently Asked Questions