USMLE Step 1 Exam: Format, Length, Eligibility, Subjects, and Scoring

The USMLE Step 1 exam is an 8-hour licensing exam with a pass/fail scoring system – the first of three required tests you must pass to practice medicine in the United States. It consists of multiple-choice questions on general scientific principles, medical disciplines, and clinical knowledge. To be eligible, you must be a medical student or graduate of a qualifying institution.

The USMLE is open to both U.S. and international medical students. According to recent performance data from state medical boards, more than 57,000 applicants sat for the USMLE Step 1, with up to 91% earning passing scores.

This guide walks you through the exam format, number of attempts, key subjects and organ systems, study prep, registration, scoring, and everything you need to know before test day.

What Is the USMLE Step 1 Exam, How Does It Fit Into the Full Licensing Journey, and Who Needs to Take It?

The USMLE stands for the United States Medical Licensing Examination – a three-step exam series required to practice medicine in the U.S. If you are wondering how Step 1 fits into the bigger picture: Step 1 tests foundational science knowledge, Step 2 CK (Clinical Knowledge) focuses on clinical skills and patient care decisions, and Step 3 assesses your ability to manage patients independently. You must pass all three steps to obtain a full medical license.

Passing Step 1 is a prerequisite to advancing in the USMLE sequence and, for most medical schools, a requirement before beginning third-year clinical rotations. That is why understanding what this exam covers – and preparing for it early – matters so much.

Most applicants take the exam by the end of their second year of medical school or at the start of their third year, when the foundational material is freshest. You can also take it after graduating with an MD, but keep in mind that all three USMLE steps must be completed within seven years of passing Step 1.

Key medical school subjects covered on Step 1 include:

• Endocrine systems
• The renal (urinary) system
• Behavioral health
• Microbiology
• The respiratory system
• Cardiovascular health

What Is the Updated Format of the USMLE Step 1 Exam in 2026, and How Many Questions and Blocks Does It Have?

Starting in May 2026, the Step 1 exam will consist of 280 multiple-choice questions, divided into 14 test blocks with 20 questions per block. You will have 30 minutes to complete each block.

You are allotted 55 minutes of total break time to distribute between blocks as needed. There is also an optional 5-minute exam tutorial at the start of the session. The total exam window is 8 hours, completed in a single day at a Prometric testing center.

If you are wondering what type of questions to expect: questions are structured as clinical vignettes. Rather than straightforward recall questions, you will be given a narrative scenario – a patient presentation, a set of symptoms, or a clinical situation – and asked to apply your medical knowledge to diagnose a condition or recommend a management plan. Expect questions that weave multiple disciplines together, such as physiology with pharmacology, or pathology with microbiology.

This exam is computer-based and must be completed on-site at a Prometric testing center.

What Key Subjects and Organ Systems Are Tested on the USMLE Step 1 Exam, and What Are the Topic Percentages?

As a second-year medical student, most of these subjects will be familiar. Here is a breakdown by discipline, with the approximate percentage of the exam each area represents:

Discipline Breakdown

• Pathology: 44-52%
• Physiology: 25-35%
• Pharmacology: 15-22%
• Biochemistry and Nutrition: 14-24%
• Microbiology: 10-15%
• Gross Anatomy and Embryology: 11-15%
• Histology and Cell Biology: 8-13%
• Behavioral Sciences: 8-13%
• Immunology: 6-11%
• Genetics: 5-9%

Pathology dominates the exam at nearly half of all questions, so it deserves the most dedicated preparation time. Physiology is a close second and frequently overlaps with pathology in clinical vignette questions.

How Are Questions Distributed Across Organ Systems on the USMLE Step 1?

In addition to the discipline breakdown, questions are distributed across organ systems. Here is what to expect by system:

• General Principles (foundational science): 12-16%
• Behavioral Health and Nervous Systems/Special Senses: 9-13%
• Respiratory and Renal/Urinary Systems: 9-13%
• Reproductive and Endocrine Systems: 9-13%
• Blood and Lymphoreticular/Immune Systems: 7-11%
• Multisystem Processes and Disorders: 6-10%
• Musculoskeletal, Skin, and Subcutaneous Tissue: 6-10%
• Social Sciences and Communication: 6-9%
• Cardiovascular System: 5-9%
• Gastrointestinal System: 5-9%
• Biostatistics and Epidemiology/Population Health: 4-6%

Some questions will include accompanying multimedia such as histopathology slides, radiographs, and pedigree charts. Being comfortable interpreting these visuals as part of a clinical vignette is an important part of your prep.

Why Did the USMLE Step 1 Change to Pass/Fail Scoring, and What Does That Mean for Your Residency Application?

A question many students ask is: why did Step 1 go pass/fail, and does it still matter for residency?

The USMLE transitioned Step 1 to a pass/fail scoring model in January 2022. The decision was made to reduce the outsized influence that a three-digit score was having on residency program selection – a system that had been driving students to delay clinical rotations in pursuit of higher scores, and contributing to health equity disparities in the match process.

Here is what that means practically: a passing Step 1 score no longer differentiates you on a residency application – it simply confirms you meet the baseline. Residency programs now place significantly greater weight on your Step 2 CK score, your clinical rotation performance, letters of recommendation, and research experience. Passing Step 1 remains critical – you cannot proceed to Step 2 or Step 3 without it – but how you perform clinically in your third and fourth years now carries far more weight in the match.

How Is the USMLE Step 1 Scored, What Is the Minimum Passing Score, and When Are Results Released?

The USMLE Step 1 uses a pass/fail scoring model. You need a minimum score of 196 to pass, which corresponds to answering approximately 60-65% of questions correctly.

If you pass, you will receive a PASS notice. If you fall short, you will receive a score report showing how close your performance was to the passing threshold – a useful reference for targeted retake preparation.

Scores are typically released within 2 to 4 weeks after the exam date.

How Many Times Can You Retake the USMLE Step 1 Exam, and What Happens After a Fourth Failed Attempt?

You may retake the USMLE Step 1 a total of four times. If you do not pass on your fourth attempt, you are permanently ineligible to retake Step 1. The same four-attempt limit applies to each USMLE step separately.

Within any 12-month period, you are limited to three attempts. Your fourth and final attempt must be taken within 12 months of your first attempt.

All attempts count toward this total – including incomplete attempts. If you begin a session and do not finish it, it still counts as one of your four attempts.

If you did not pass on your first attempt, enroll in a structured USMLE Step 1 study program immediately. These programs identify weak areas through targeted practice exams and help you close knowledge gaps before your next attempt.

How Long Is a USMLE Step 1 Passing Score Valid, and Does It Count Toward the Seven-Year Completion Rule?

A common concern among students – especially those taking a gap year or navigating delays in their training – is whether a USMLE Step 1 passing score expires.

It does not. A passing Step 1 score is permanent. Once you pass, you do not need to retake the exam. However, it is important to understand how this interacts with the seven-year rule: all three USMLE steps must be completed within seven years of the date you pass Step 1. The clock starts at Step 1 and runs forward. If Steps 2 and 3 are not completed within that window, you may face additional requirements depending on your state licensing board.

Planning your Step 2 and Step 3 timelines early – particularly if you anticipate any gaps in your training – is strongly recommended.

When Should You Start Studying for the USMLE Step 1 Exam to Give Yourself the Best Chance of Passing?

Ideally, start preparing for Step 1 during your first year of medical school. You only have four attempts to pass, so starting early significantly improves your odds of passing on the first try.

Year 1 of medical school builds the foundational knowledge you will rely on for the more intensive preparation in Year 2. Aim to shift into serious USMLE-specific prep 12 months before your exam date, with the final 6 months dedicated to focused, structured study.

Treat USMLE prep as another course in your schedule – not a separate activity you’ll get to later. Aligning your medical school coursework with your Step 1 preparation from the start is one of the most effective study strategies available.

As the exam date approaches, target at least 8 to 10 hours of daily study during the final 4 to 8 weeks before test day.

Balance that intensity with strong wellness habits to avoid burnout. Prioritize sleep, hydration, and consistent nutrition throughout your prep window – you cannot perform at your best on an 8-hour exam if you are running on empty leading up to it.

Frequently Asked Questions About the USMLE Step 1 Exam: Registration, Fees, Test Day, and Accommodations

Can You Request Testing Accommodations for the USMLE Step 1 Exam?

Yes. If you have a documented condition as defined by the Americans with Disabilities Act (ADA) – including ADHD – you may request test-taking accommodations. Submit your request at least 60 days before your test date using the form available on the official USMLE website. Your request should be submitted alongside your exam application. The earlier you apply, the better.

How Do You Apply and Register for the USMLE Step 1 Exam?

If you are a U.S.-based medical student, register through the National Board of Medical Examiners (NBME). International students outside the U.S. register through the Federation of State Medical Boards (FSMB). Both paths require a USMLE ID, which typically involves a notarization process and completing Form 186 for identity verification.

Once registered, use your USMLE ID to schedule your exam through the Prometric testing website. You will need to select a 3-month testing window, so choose a timeframe that realistically aligns with your preparation.

What Are the Current Exam Fees for the USMLE Step 1 in 2026?

The current exam fee for 2026 is $695 for U.S. and Canadian applicants. If you plan to test outside the U.S. or Canada, an additional international region fee of $210 applies, bringing total costs to $1,000 or more when international testing center charges are factored in.

If you need to reschedule, rescheduling fees apply. The standard fee is $70, but this increases significantly the closer to your exam date you make the change – the later the request, the higher the cost. Exam fees are non-refundable, so select a test date that truly matches where you are in your preparation.

What Should You Expect on USMLE Step 1 Test Day at a Prometric Center?

Many students want to know what to expect when they actually arrive at the testing center. Here is what the process looks like:

• Bring a valid, government-issued photo ID – your USMLE scheduling permit will specify acceptable forms.
• Personal items including phones, watches, and bags are not permitted in the testing room. You will store them in a provided locker.
• The testing room is monitored by both staff and cameras throughout the session.
• Check-in may include fingerprinting or palm vein scanning, depending on the Prometric location.
• The optional 5-minute tutorial is available at the start of your session. Use it if you need time to orient yourself, or skip it to preserve break time.

Arriving at least 30 minutes before your scheduled start time is strongly advised. Check-in takes time, and any delays reduce your available exam session.

Are There USMLE Step 1 Practice Exams to Help You Prepare for the Real Test?

Yes. Archer Review offers a comprehensive USMLE Step 1 study plan with integrated instruction and a study model built for long-term subject mastery. Aim for a consistent 70% score on practice exams before your test date – if you can hit that benchmark on four or more consecutive attempts, you are well prepared for the real thing.

Archer Review’s full Qbank helps you master high-weight subjects like pharmacology, with access to bonus courses including biostatistics. Identifying weak areas before test day is the single most important thing you can do to pass on your first attempt.

Start Prepping for the USMLE Step 1 Test

With your medical school curriculum building the foundation you need, now is the time to get serious about your USMLE Step 1 preparation. Understand the format, study the subject weightings, know your registration steps, and build a study schedule that gives you enough runway to pass on the first attempt.

Archer Review offers the structure you need to master the USMLE Step 1 inside and out. Explore the preclinical bundle or subscribe month-to-month for access to over 300 whiteboard lessons, 1,500 illustrated notes, and more than 1,400 Qbank questions.