If you are an international medical graduate (IMG) preparing for residency or another pathway that requires the National Assessment Collaboration (NAC) Examination, understanding how the exam works is an important first step.
The NAC Examination is an objective structured clinical examination (OSCE) that assesses clinical skills and behaviours expected of a Canadian medical graduate entering postgraduate training. It tests how you apply clinical knowledge in patient-centred encounters—not simply how much information you can recall.
This guide explains the current NAC OSCE format, competencies, scoring, eligibility, scheduling and preparation approach, with links to more detailed MedCognito guides where useful.
What Is the NAC Examination?
The National Assessment Collaboration Examination, commonly called the NAC Examination or NAC OSCE, is a national clinical examination administered by the Medical Council of Canada (MCC).
Candidates work through standardized clinical stations where they may be asked to take a focused history, perform or describe an examination, interpret information, discuss investigations, formulate a diagnosis or management plan, and communicate effectively with a standardized participant.
For the most current administrative requirements, candidates should always confirm details on the official MCC NAC Examination page.
What Is the Current NAC OSCE Format?
The standard NAC Examination consists of 12 stations. Each station lasts 11 minutes, with 2 minutes between stations. Of the 12 stations, 10 are operational stations that contribute to the examination score and 2 are pilot stations.
Candidates do not know which stations are pilot stations, so every station should be approached as though it contributes to the result.
A station generally provides written instructions describing the clinical situation and the tasks you are expected to complete. Depending on the station, you may interact with a standardized participant while a physician examiner assesses your performance.
What Competencies Does the NAC Examination Assess?
The NAC Examination can assess up to seven competencies:
- History taking
- Physical examination
- Diagnosis
- Management
- Investigations
- Data interpretation
- Communication skills
Not every station tests every competency. The specific task determines what you need to demonstrate.
This is why effective NAC preparation should go beyond memorizing scripts. Candidates need to identify the task quickly, gather relevant information, reason clinically, communicate clearly and prioritize within the station time.
What Clinical Areas Can Appear on the NAC OSCE?
NAC stations can draw on common clinical presentations across disciplines such as medicine, surgery, pediatrics, obstetrics and gynecology, psychiatry, and preventive medicine or public health.
The more useful preparation strategy is not to predict exact cases. Instead, develop transferable clinical skills that you can apply when the presentation changes.
Who Is Eligible to Take the NAC Examination?
NAC eligibility depends on your medical education status and whether your medical school and degree meet MCC requirements. International medical graduates generally need an acceptable medical degree from a school recognized for Canadian purposes, while eligible medical students must meet the MCC’s timing requirements for completion of their degree.
Because eligibility requirements can change and individual circumstances differ, confirm your eligibility directly through the MCC and physiciansapply.ca before making exam or travel plans.
How Often Is the NAC Examination Offered?
The NAC Examination is normally administered in scheduled sessions at examination centres in Canada. Session dates, application windows and available centres can change from one administration to another.
Rather than relying on an old annual schedule, check the MCC NAC scheduling page for the current examination dates, application period and scheduling instructions.
Where Do You Take the NAC Examination?
The examination is delivered at designated centres in Canada. Centre availability varies by session, and the MCC provides current scheduling and assignment instructions during the application process.
Your examination location does not itself determine where you can later apply for residency. Residency eligibility and selection requirements are determined separately by the relevant programs, provinces and matching rules.
How Is the NAC OSCE Scored?
The current NAC Examination score-reporting scale runs from 500 to 700, and the current pass score is 577. Ten operational stations contribute to the total score; the two pilot stations do not.
The NAC is criterion-referenced. In practical terms, your performance is evaluated against the standard required for the examination rather than against a fixed percentage of other candidates.
A score of 577 or higher is a pass. However, the MCC does not publish official categories stating that 600 is a “good” score, 620 is “competitive,” or another particular score is “excellent.” A higher score represents stronger overall examination performance, but residency programs may consider many factors when evaluating applicants.
For a detailed explanation of the scale and how to interpret your result, read What Is a Good NAC OSCE Score? 2026 Guide.
Does the NAC OSCE Result Expire?
NAC results do not have a routine expiry date. If you take the examination more than once, the rules governing which result is considered valid should be checked against current MCC and residency application requirements.
If you are considering a retake, confirm the current attempt and scheduling rules before registering, because these administrative policies can change.
How Long Does It Take to Prepare for the NAC OSCE?
There is no official MCC requirement to study for a particular number of weeks. Preparation time depends on your recent clinical experience, familiarity with OSCE-style assessment, communication skills, weaknesses and the amount of time you can practise consistently.
Some candidates with recent clinical experience may use an intensive shorter preparation period, while others benefit from several months of structured practice. The key measure is whether you can perform consistently in timed, unfamiliar stations.
Our dedicated guide, How Long Does It Take to Study for the NAC OSCE?, provides practical 4-, 6–8- and 10–12-week planning frameworks. These are preparation frameworks, not MCC-prescribed timelines.
How Should You Prepare for the NAC OSCE?
Effective preparation should combine clinical review with repeated performance practice. Reading alone does not reproduce the demands of an OSCE.
1. Learn the Exam Structure
Know what can happen during an 11-minute station, how instructions are presented and which competencies may be assessed. This reduces wasted time trying to understand the mechanics of the exam while you should be concentrating on the patient and task.
2. Practise Focused History Taking
A strong history is not simply a long checklist. Practise asking relevant questions, following important clues and adapting your approach to the patient’s responses.
3. Practise Focused Physical Examination
Be able to select an examination appropriate to the task and perform it in an organized, patient-centred way.
4. Strengthen Clinical Reasoning
Practise converting findings into a reasonable differential diagnosis, investigation strategy and management plan. Your reasoning should fit the information available rather than a memorized case template.
5. Treat Communication as a Clinical Skill
Communication is explicitly assessed. Practise explaining, counselling, showing empathy, checking understanding and responding professionally to patient concerns.
6. Practise Under Time Pressure
Complete full stations using the actual station time. Do not stop the clock every time you make a mistake. Finish the encounter, obtain feedback, identify what went wrong and then repeat the skill.
For a deeper preparation framework, see How to Prepare for the NAC OSCE.
What If You Have Failed the NAC OSCE Before?
A previous unsuccessful attempt should guide your next preparation cycle. Review your performance feedback and identify whether the main problem was clinical knowledge, station organization, communication, physical examination, reasoning, timing or inconsistency across cases.
Our guide on what to do after a failed NAC OSCE explains how to structure a more targeted second attempt.
What Is the NAC OSCE Pass Rate?
Pass rates can vary by examination administration and candidate group, so a historical percentage should not be treated as a personal probability of passing.
If you are researching historical performance data and what it means for your preparation, see our NAC OSCE pass-rate guide.
How to Choose a NAC OSCE Prep Course
If you decide to use a structured course, evaluate it by how well it supports active clinical practice rather than by the amount of content alone.
Useful features can include:
- realistic OSCE-style cases;
- timed station practice;
- communication practice;
- physical examination training;
- clinical reasoning and management practice;
- feedback that identifies specific weaknesses; and
- a structure that fits your remaining preparation time.
MedCognito’s NAC OSCE preparation course is available for candidates who want a structured approach to preparation.
A course should support active practice, not replace it. Candidates still need repeated station work, feedback and correction of weaknesses.
NAC Examination Fees
NAC Examination fees and withdrawal or administrative charges can change. Check the MCC’s current fee and scheduling information before registering rather than relying on figures from a previous examination cycle.
Frequently Asked Questions
What does NAC OSCE stand for?
NAC refers to the National Assessment Collaboration Examination. It is an objective structured clinical examination used to assess clinical skills and behaviours expected at the level required for entry into Canadian postgraduate medical training.
How difficult is the NAC OSCE?
The challenge is not limited to medical knowledge. Candidates must apply clinical knowledge while communicating effectively, completing the assigned task and managing an 11-minute station. Repeated timed practice is therefore an important part of preparation.
What is a good NAC OSCE score?
The current scale is 500–700 and the pass score is 577. MCC does not define an official “good” score such as 600+. Scores above 577 indicate performance above the pass standard, but there is no official MCC competitive-score category.
Is the NAC OSCE pass/fail?
Candidates receive a numerical score on the 500–700 scale as well as a pass/fail result. A score of 577 or higher meets the current pass standard.
How many stations are on the NAC OSCE?
The standard examination has 12 stations: 10 operational stations that contribute to scoring and 2 pilot stations. Each station lasts 11 minutes, with 2 minutes between stations.
How long should I study for the NAC OSCE?
There is no official required study duration. Your preparation period should depend on your baseline skills, recent clinical experience, available practice time and performance in timed stations.
Final Takeaway
The NAC OSCE tests whether you can apply clinical knowledge and demonstrate appropriate clinical and communication skills in standardized patient encounters. The current format uses 12 stations, with 10 contributing to the score, and the current pass score is 577 on a 500–700 reporting scale.
Use this page as your overview, then focus your preparation on the areas you specifically need to improve: preparation strategy, study timeline, score interpretation, or planning after an unsuccessful attempt.
