The honest, practical guide every osteopathic resident deserves before taking COMLEX Level 3.

You survived anatomy lab, endless lectures, and shelf exams, then made it through COMLEX Level 1 and you conquered Level 2-CE. You matched into residency. And now, you’re taking care of real patients every single day.

There’s just one more hurdle before you complete the COMLEX licensing series: COMLEX-USA Level 3. 

If you’re reading this, you’re probably asking yourself one (or all) of these questions:

• How hard is COMLEX Level 3?
• When should I take it?
• How much do I actually need to study?
• What resources are worth paying for?
• What are these CDM cases everyone keeps talking about?

I’ve helped residents prepare for COMLEX exams for years, and I’ve noticed something interesting: the residents who struggle aren’t usually the ones who know the least medicine. They’re the ones who don’t have a plan.

This guide is the roadmap I wish every resident had before they started studying. It covers everything you need to know for the 2026–2027 COMLEX Level 3 exam, including major changes coming in 2027.

Important Updates for 2027

Beginning January 13, 2027, COMLEX Level 3 transitions to a 1-day examination while continuing to assess the same competency domains and blueprint. The blueprint remains unchanged, but the testing experience becomes shorter. A compare and contrast table is provided below. 

You may also find more information on the NBOME website here at this link.

What is COMLEX Level 3?

COMLEX-USA Level 3 is the final licensing examination for osteopathic physicians. Tested content follows the COMLEX-USA Blueprint.

The goal isn’t to see if you’ve memorized every rare disease or obscure metabolic pathway. The NBOME wants to know something much more important: Can you safely practice medicine as an independent physician?

Many questions ask “What should you do next?” rather than “What is the diagnosis?”  Think Level 2, but more nuanced decision-making. 

Level 3 assumes you’re already functioning as a physician and therefore focuses heavily on:

• Managing common inpatient problems
• Prioritizing workups
• Recognizing emergencies
• Choosing appropriate treatments
• Counseling patients
• Preventive care
• Osteopathic principles and manipulative medicine (yes, OMM is still here!)

If you’ve spent a few months in residency, you’ll likely quickly recognize many of the scenarios because you’ve already taken care of these patients.

Who Can Take COMLEX Level 3?

To be eligible, you must:

• Pass COMLEX-USA Level 1
• Pass COMLEX-USA Level 2-CE
• Graduate from a COCA-accredited osteopathic medical school
• Receive a good academic and professional standing attestation from your residency program director
• Register through the NBOME before scheduling your exam 

Residents generally take Level 3 during their PGY-1 year, although timing varies by specialty and residency program requirements. 

What is a Good COMLEX Level 3 Score?

The minimum passing score for COMLEX-USA Level 3 is 350.

Most residents should focus less on chasing a specific number and more on demonstrating consistent readiness across clinical decision-making, patient management, and osteopathic principles.

Programs primarily require successful completion for licensure, although individual programs may have different expectations. 

Is COMLEX Level 3 Hard?

It’s challenging, but probably not for the reason you think.

The medicine is generally less obscure than previous board exams. Instead, the difficulty comes from balancing studying with residency. Some days you may only have time for 20 questions after work and some weeks you’ll be on nights. Some weeks you’ll barely touch your question bank. That’s normal.

The residents who do well aren’t necessarily the smartest. They’re the ones who stay consistent. 20 focused questions every day for 8 weeks will almost always beat trying to cram 1,500 questions into the last two weekends before your exam.

Consistency wins!

When Should You Take COMLEX Level 3?

Most residents take COMLEX Level 3 during intern year, but the “best” time depends on your residency program and schedule.

Aim for a time when:

• You’re several months into residency and somewhat settled.
• You’ve had a few months of inpatient experience.
• During a lighter rotation or elective when you can study consistently.
• You’re not on a rotation with major responsibilities such as ICU, trauma, or night float. 
• You can dedicate 6-12 weeks to steady preparation.

Don’t wait for the “perfect” month. It probably doesn’t exist. Instead, choose a period when your workload is manageable enough that you can study consistently. Consider your extracurricular activities and other time commitments.

You may choose to wait until January 13, 2027 if you are considering the 1-day format.

My advice is to plan ahead and create a solid study schedule! Start early! 

My Favorite Resources

What matters most is using a few high-quality resources consistently. 

TrueLearn Question Bank:

• Questions feel very similar to COMLEX
• Detailed explanations, images, and charts/tables for learning
• OMM is integrated throughout
• Great analytics dashboard and progress tracking
• Built-in flashcards for spaced repetition
• Offers a Level 3 Predictive Assessment Exam

AMBOSS:

• Rapid review
• Filling knowledge gaps
• Excellent OMM content review
• Excellent step-by-step clinical management algorithms
• Reference reading during residency 

Official NBOME Practice Resources:

Incorporate COMSAE for Phase 3 and sample questions into your study plan. 

This is non-negotiable! Perfect resources to give you exposure to the style of questions you can expect to see on test day. They’re the closest thing you’ll see to the real testing experience. Avoid any unnecessary surprises if possible!

CDMCases.com:

If you’re nervous about the Clinical Decision-Making portion, CDMCases.com is one of my favorite supplemental resources. It costs roughly $70-110 depending on the length of the subscription. 

This resource provides 140 CDM cases that allow you to practice with an interactive and realistic interface. It provides valuable practice with the workflow, structure, and decision-making style of CDM cases.

Think of it as practice for how to take the exam, not just what to know.

Clinical Decision-Making (CDM) Cases

The CDM portion is unique to COMLEX Level 3. It requires repeated exposure in order to develop fluency with the CDM format and language. 

Rather than answering a single multiple-choice question, you’ll work through a patient case and make management decisions. Some questions require selecting multiple correct answers, while others require short constructed responses. The emphasis is on sound clinical judgment rather than memorizing obscure facts. 

Each CDM case presents a clinical scenario followed by 2–4 sequential questions. The questions may ask you to:

• Obtain additional history
• Perform a focused physical exam
• Order laboratory tests or imaging
• Make a diagnosis
• Treat when appropriate
• Decide on patient’s disposition (admit, discharge, ICU, follow-up)
• Counsel the patient (i.e., lifestyle changes), if necessary
• Recommend follow-up, if necessary

Each answer influences the next part of the case. Once you submit an answer and move forward, you cannot go back and change it. 

The 2 Types of CDM Questions

1. Extended Multiple-Choice Questions

These aren’t your typical “pick one answer” questions.

Instead, you’ll see a list of options and instructions such as: “Select up to 5 options.”

You receive credit only if you:

• Select the correct answer(s).
• Stay within the maximum number of allowed selections.
• Avoid choosing any option that is harmful or represents unnecessary use of healthcare resources.

2. Short-Answer Questions

These require you to type your own response.

This is where many residents lose easy points. Not because they don’t know the answer, but because they don’t answer the way the NBOME expects.

Follow these rules:

• • Avoid abbreviations
    • Spell out the words! 

• Instead of writing “IV”, write “intravenous”

• • One answer per box only
  • Be specific
    • Specify drug names (I recommend knowing the generic names) and routes of administration. Drug doses are not required.

• Instead of writing “Antibiotic”, write “Intravenous ceftriaxone”. 

• • • Include the anatomic site for imaging studies when appropriate. 

• Instead of writing “CT”, write “CT abdomen and pelvis with intravenous contrast”

• • Consults need a purpose
    • The NBOME expects you to specify what you’re asking the consultant to do, not just which specialty to call.

• Instead of writing “Consult cardiology”, write “Consult cardiology for cardiac catheterization”

• • OMM answers must be specific
    • Specify both the technique and the anatomic location. 

• Instead of writing “OMT”, write “Muscle energy for left first rib somatic dysfunction”.

Common CDM Mistakes

Some of the most frequent errors include:

• Ordering treatments before stabilizing an unstable patient.
• Forgetting initial supportive care (e.g., IV access, oxygen, cardiac monitoring when appropriate).
• Overlooking preventive counseling or appropriate follow-up.
• Ignoring osteopathic considerations when relevant.
• Choosing outdated diagnostic tests instead of current guideline-recommended studies.
• Failing to recognize when immediate intervention is more important than obtaining additional diagnostic information.

You may find detailed information regarding the approach to CDM cases at the official NBOME website here. 

Sample Study Timeline (12 weeks)

• 12 Weeks Before
  • Choose your primary question bank.
  • Complete a diagnostic assessment.
  • Build a realistic weekly study schedule.
  • Aim for 15–20 TrueLearn questions per day on busy rotations and 40 questions on lighter rotations. Review explanations thoroughly and start a review system (i.e., Anki cards or note-taking).
  • Aim for 1-2 CDM cases per day. 
  • Start identifying weak topics. 
• 8 Weeks Before
  Increase to:
  • 25-40 TrueLearn questions daily, with more if possible. Review explanations thoroughly and continue with Anki cards/note-taking. 
  • 2-4 CDM cases per day. 
  • Continue with targeted review of weak topics.
• 4 Weeks Before
  • Complete any remaining TrueLearn questions and CDM cases.
  • Revisit incorrect questions.
  • Continue targeted review of weaker topics. 
  • Review OMM daily.
  • Take the TrueLearn COMLEX Level 3 Predictive Assessment Exam.
• Final 2 Weeks
  • At the 2-week mark, take the COMSAE Phase 3 Practice Assessment.
  • Continue to focus on:
    • Incorrect questions
    • High-yield algorithms
    • OMM review
    • Ethics
    • Preventive medicine
    • Screening guidelines
    • Biostatistics

Every resident’s Level 3 preparation journey is different, and the ideal study plan depends on your baseline knowledge, available study time, residency schedule, and individual strengths and weaknesses. There is no “one-size-fits-all” approach. A personalized approach can help you identify your weaknesses, choose the right resources, and stay accountable throughout preparation.

For residents looking for additional guidance, Elite Medical Prep tutors provide individualized coaching and customized study plans designed to help you maximize your preparation and approach COMLEX Level 3 with confidence.

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