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COMLEX Level 1 tests your ability to apply foundational biomedical science and osteopathic principles to clinical scenarios. The National Board of Osteopathic Medical Examiners (NBOME) organizes all exam content across two dimensions:
Every question connects to both. You’ll never see a pure anatomy recall question or a standalone pharmacology item. Each vignette requires you to integrate basic science with clinical reasoning and osteopathic thinking.
The single largest content area is Application of Knowledge for Osteopathic Medical Practice, which accounts for 60% of the exam’s content, according to the COMLEX Blueprint. Within that domain, 75% of questions draw from foundational biomedical sciences.
Roughly half of the entire exam tests whether you can take a biochemistry, pathology, or pharmacology concept and use it to solve a clinical problem.
COMLEX Level 1 contains 320 single-best-answer questions divided across eight sections of 40 questions each. Compared to the previous format, you now have slightly more time per question.
In the old format, 352 questions across two four-hour sessions gave you roughly two minutes and 44 seconds per item. The new 320-question format pushes that closer to three minutes per item. An extra 15 to 20 seconds per question adds up across a full exam day, especially on vignettes that require you to read through a long patient history, interpret lab values, and reason through mechanism-based answer choices.
Dimension 1 organizes all questions into seven competency domains that define what an osteopathic physician must know and be able to do. Each domain accounts for a minimum percentage of the exam.
Dimension 2 organizes all questions into 10 clinical presentation categories based on why patients seek osteopathic care. These categories map to body systems and patient contexts. Each carries a minimum percentage of the exam.
COMLEX Level 1 runs 320 single-best-answer questions across eight sections in an eight-hour testing window.
Here’s the complete format breakdown for both the old and new versions to easily see what’s changed:
Take COMLEX Level 1 in the first two weeks of June, immediately after finishing your OMS-II coursework. Your college of osteopathic medicine (COM) must certify your eligibility before you can register, so the exact timing depends on when your school signs off.
Schedule your exam at least four months in advance. Seats at Prometric centers fill quickly during peak testing season, and waiting too long limits your options for preferred dates and locations.
The 2026-2027 testing cycle opened on May 7, 2026, and it runs through April 10, 2027. Registration typically opens six months before the start of each testing window. Set up your NBOME portal account early so you’re ready to register the moment your COM confirms eligibility.
Below are the official testing windows and score release dates for the 2026-2027 cycle:
The NBOME releases scores two to six weeks after each testing window closes. The NBOME posts results by 5 p.m. CST on the scheduled release date, though many students report seeing scores earlier in the day.
Pick a date that lands at the end of your dedicated study period, not at the beginning of a convenient break. A common mistake is choosing a test date based on when school obligations lighten up rather than when preparation will peak. Work backward from your target date. If you need eight to 12 weeks of focused prep, count back from the testing window that aligns with your readiness.
Students testing in the May or early June windows benefit from peak study momentum right after finishing OMS-II coursework. Testing later in the summer gives you more prep time but introduces a risk of content decay on material you covered months earlier. Either approach works if you structure your study plan around the specific date.
Avoid scheduling within a week of a major personal commitment (a move, a wedding, travel). You want the 48 hours before your exam to involve nothing but light review and rest. Check your Prometric center's availability early because popular locations in major metro areas book out fast during May and June.
Pick the COMLEX Level 1 schedule that matches your realistic availability, not the one that sounds most ambitious. Every plan assumes you’re using a primary question bank, a content review system, and the Savarese osteopathic manipulative treatment (OMT) review (or your school's OMT resource) for osteopathic-specific material.
Take a Comprehensive Osteopathic Medical Self-Assessment Examination (COMSAE) baseline exam before starting any plan so you know where your gaps are.
A six-month timeline works best for students who begin studying during the second half of OMS-II while still in coursework. Expect three to four hours of dedicated COMLEX prep per day on top of class obligations, increasing to six or more hours per day in the final two months.
A three-month plan suits students who start dedicated prep immediately after finishing OMS-II coursework. Expect six to eight hours of focused study per day, six days per week. Take one full day off each week.
Two months require aggressive daily volume (eight to 10 hours, six days per week) and assume you have a solid foundation from OMS-II. There is no room for a slow content review phase. Content review and question bank work happen simultaneously from Day 1.
One month is the minimum viable timeline and only works if you’ve been studying consistently throughout OMS-II. Expect 10+ hours per day with one rest day per week. Every session must be high-yield and targeted.
Step 1: Create your NBOME portal account. Visit nbome.org and set up an online account. Most COMs invite students to do this during OMS-I (often around November of the first year). If you haven’t set up your account and need help, email clientservices@nbome.org for instructions.
Step 2: Confirm eligibility with your COM. Your school has to mark you as eligible in the NBOME system before you can register. Eligibility requirements vary by school but typically include passing all OMS-I and OMS-II courses and completing required academic milestones. Some COMs also require a minimum COMSAE score before clearing you to sit for the exam. Check your school's specific policy early so you’re not caught off guard.
Step 3: Register and pay the exam fee. Once your COM confirms eligibility, log in to your NBOME portal and navigate to the "Purchase Exam" section. Select COMLEX-USA Level 1 and pay the $745 exam fee. If Level 1 doesn’t appear as an option, your school has not yet marked you eligible. Contact your COM's academic advisor to verify your status.
Step 4: Schedule your test date at a Prometric center. After registering, select your preferred testing date and location. Testing dates open up to six months in advance. The NBOME recommends scheduling at least 120 days before your desired date. Popular centers in major metro areas fill quickly during peak season (May through July), so don’t wait. You can’t schedule an exam less than five calendar days before the test date.
Step 5: Receive your confirmation and prepare for the test day. After scheduling, your appointment details will appear in your NBOME portal. Bring a valid, unexpired government-issued photo ID on exam day. The name on your ID has to exactly match the name in your NBOME portal. Candidates who arrive with a mismatched ID won’t be allowed to test.
Most students treat osteopathic manipulative medicine (OMM) as a separate subject and cram it in the final week. That approach misses how the NBOME actually writes questions.
OMM content doesn’t sit in its own silo on the exam. Viscerosomatic reflexes, Chapman points, and OMM technique selection appear inside cardiology, pulmonology, GI, and OB/GYN vignettes.
A question might present a patient with pneumonia, describe fever and productive cough, and then ask which thoracic spinal levels would show tissue texture changes (T2-T7 for the lungs) and what OMM sequence to initiate (rib raising to reduce sympathetic tone, suboccipital release to optimize vagal outflow, then lymphatic techniques to support drainage).
Build OMM into every system as you study it. When you review pneumonia pathophysiology, immediately link it to the sympathetic innervation levels for the lungs, the relevant Chapman reflex points, and which OMM techniques are indicated versus contraindicated.
Savarese is the go-to resource. But the real learning happens when you connect each Savarese chapter to the corresponding Pathoma or First Aid organ-system chapter and study them together in a single session.
By exam day, you should be able to hear any organ system diagnosis and immediately recall the associated spinal levels, Chapman points, and first-line OMM approach without pausing to think.
Reviewing wrong answers by subject ("I missed a cardiology question") gives you incomplete data. Start categorizing every missed question bank item into one of four error types:
Each error type requires a different solution to prevent it from happening again.
Knowledge gaps need targeted content review. Reasoning errors need you to practice multi-step logic on similar vignettes. Misreads need you to slow down and underline key qualifiers like "most likely," "next best step," and "initial." Second-guessing needs a personal rule: Don’t change an answer unless you find concrete evidence in the stem that your first choice was wrong.
Track the ratio across your entire question bank. If 50% of your errors are knowledge gaps, you need more content time.
If 40% are reasoning errors, you need to do more questions in timed mode with full explanation review rather than re-reading First Aid.
Most students never learn their most common error type because they only sort by topic and assume every wrong answer means "I need to study that subject more."
The COMSAE is the NBOME's official self-assessment exam, which uses retired COMLEX questions. Many COMs require a minimum COMSAE score (often 450 or higher) before they will certify you to sit for Level 1. Students fixate on the three-digit number, but the real value of the COMSAE is the overview of your performance.
After each COMSAE, look at your performance profile and identify which Dimension 1 and Dimension 2 categories rated "low." Those categories tell you exactly where to focus your next study block.
For example, a student scoring 480 overall with a "low" in musculoskeletal and a "low" in community health has a completely different action plan than a student scoring 480 with "lows" in nervous system and circulatory.
Take your first COMSAE four to six weeks before your test date as a true baseline. Take a second one two to three weeks out. Take a final one seven to 10 days before the exam. Don’t take more than three or four total. Each COMSAE costs money, doesn’t provide answer explanations, and uses retired questions you can’t review afterward.
Treat each one as a diagnostic checkpoint, not a score prediction. Together, your question bank percentage and COMSAE trend provide a much more reliable readiness signal than any single COMSAE number.
Try out our free COMLEX Level 1 Practice Questions Quiz to see if you’re ready for the COMSAE.
The basic science content on COMLEX Level 1 overlaps significantly with USMLE Step 1. And many DO students use UWorld as their primary question bank. UWorld is an excellent learning tool, but relying on it exclusively creates a gap.
COMLEX vignettes differ from USMLE vignettes. COMLEX stems tend to be longer and more clinically oriented, emphasizing what you’d do with a patient rather than testing isolated recall of mechanisms. Questions frequently integrate osteopathic reasoning into otherwise standard clinical scenarios. The answer choices may include OMM options alongside pharmacologic and surgical ones.
Use a COMLEX-specific question bank (such as COMBANK, COMQUEST, or the AMBOSS COMLEX Qbank) for at least 30% to 40% of your total question volume.
Doing COMLEX-format questions trains you to parse the longer stems efficiently, recognize when a vignette is setting up an OMM answer, and avoid overthinking questions that are testing clinical application rather than molecular detail.
Students who practice exclusively with USMLE-style questions often feel disoriented by the pacing and question structure on the actual COMLEX, even when they know the underlying content well. Mixing question bank formats eliminates that surprise.
Knowing the material and performing under exam conditions are two different skills. COMLEX Level 1 is an eight-hour test that requires intense concentration across 320 questions. Students often drop their accuracy in sections six through eight, not because the questions are harder, but because their ability to read carefully and reason through multi-step vignettes breaks down.
Schedule at least two full-length simulated exam days during your dedicated study period. Block out eight hours, sit at a desk (not a couch), set a timer, and complete 320 questions in eight sections of 40 with the same break structure you’ll have on test day.
Use 60 minutes of break time distributed across seven breaks, just like the real exam. Eat the same snacks. Drink the same amount of water. Learn whether you fade in the afternoon and need a longer midday break or whether short, frequent breaks keep you more in tune.
Full simulations also reveal pacing problems you can’t detect in shorter blocks. You might discover that you consistently slow down on questions with lab tables, or that you spend too long on OMM vignettes because you second-guess technique selection. Identifying those patterns two weeks before exam day gives you time to fix them. Discovering them on test day doesn’t.
If you're struggling with the COMLEX Level 1 test, get expert help with COMLEX prep. Our 99th-percentile tutors know what it takes to achieve a competitive score.
Passing Level 1 allows you to begin OMS-III clinical rotations at most COMs. Your school's registrar's office will verify your result and update your academic record. From there, the focus shifts to clerkships and preparing for COMLEX Level 2-CE, which you’ll typically take at the end of the third year or early in the fourth year.
OMS-III clerkships put the foundational science you studied for Level 1 into a clinical context. Pathophysiology, pharmacology, and anatomy concepts reappear daily as you evaluate real patients, develop differential diagnoses, and write treatment plans. Students who studied for Level 1 by understanding mechanisms rather than memorizing isolated facts find that clerkships naturally reinforce and deepen that knowledge.
Most students sit for the COMLEX Level 2-CE in late OMS-III or early OMS-IV, after completing most core clerkships. Level 2-CE tests clinical decision-making across all major disciplines and carries a three-digit numeric score alongside its Pass/Fail result.
That numeric score now serves as one of the primary academic metrics residency programs use to evaluate DO applicants, since Level 1 no longer reports a number.
Plan your Level 2-CE test date around your residency application timeline. ERAS applications typically open in September of your OMS-IV year, and having a passing Level 2-CE score in hand before you submit strengthens your application.
Students who delay Level 2-CE until late fall risk submitting applications without a score. That puts them at a disadvantage compared to applicants whose results are already available for program directors to review.
COMLEX Level 3 is the final exam in the COMLEX-USA series. You take it during your first or second year of residency rather than during medical school. Level 3 is a two-day exam that assesses your ability to practice medicine independently in an unsupervised setting. Passing Level 3 completes the licensure pathway and is required for full, unrestricted medical licensure in all 50 states.
Level 3 builds directly on everything you learned for Levels 1 and 2-CE, with an added emphasis on patient management across ambulatory and emergency settings. Most residents study for Level 3 while actively training. So, clinical experience from their first year of residency becomes their primary preparation.
The transition from "supervised practice" (Level 1 and 2-CE) to "unsupervised practice" (Level 3) reflects the NBOME's licensure framework: Each exam corresponds to a stage of increasing clinical independence on the path to becoming a fully licensed osteopathic physician.
You can find a COMLEX testing center near you by visiting the Pearson VUE test center locator and entering your ZIP code or city. The tool generates a list of nearby Prometric centers with available dates and seat availability. Schedule at least 120 days before your target test date — popular centers in major metro areas fill up quickly during peak season (May through July). If your preferred location has no openings, expand your search radius or check back weekly; canceled appointments are regularly reopened.
COMLEX is neither easier nor harder than USMLE; the two exams test overlapping content in different formats. COMLEX vignettes tend to be longer, more clinically oriented, and weighted toward what you would actually do with a patient rather than isolated mechanism recall. COMLEX also integrates osteopathic principles throughout every section, adding 12% of Dimension 1 content (OPP/OMT) that the USMLE doesn’tt test at all.
There are three COMLEX-USA exams in the current licensing series: Level 1, Level 2-CE, and Level 3. You have to pass each level in sequence before you’re eligible for the next. And all three are required for full, unrestricted medical licensure in all 50 states. Most students take Level 1 after OMS-II, Level 2-CE during OMS-III or early OMS-IV, and Level 3 during the first or second year of residency.
COMLEX stands for the Comprehensive Osteopathic Medical Licensing Examination. The NBOME administers the exam series as the primary licensure pathway for osteopathic physicians in the United States.
The most important subjects to know for COMLEX Level 1 are any subject in the Application of Knowledge for Osteopathic Medical Practice, such as pathophysiology, pharmacology, biochemistry, anatomy, and microbiology. Osteopathic Principles, Practice, and Manipulative Treatment carries the second-highest weight at 12%. On the clinical presentations side, musculoskeletal leads at 13%, followed by community health/biostatistics at 12%, and nervous system, GI, cardiovascular, and respiratory each at 10%.
Failing COMLEX Level 1 delays your progression to clinical rotations but doesn’t end your medical career. The NBOME requires a 60-day waiting period before your second attempt and 90 days between each subsequent attempt, with a maximum of four scored attempts. Your score report includes a Formative Performance Profile that rates your performance as "low," "medium," or "high" across every blueprint category, giving you a precise roadmap for rebuilding your study plan around specific weak areas. Contact your COM's academic affairs office immediately after a failing result; most schools require remediation steps or a minimum COMSAE score before allowing you to retake.
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