CPSA Mark Scheme: How the UKMLA OSCE Is Actually Marked

The CPSA mark scheme is not one fixed document. The GMC sets the standard every UK medical school's CPSA must meet, but each school builds and marks its own stations, so the precise scoring detail differs from one university to the next. This guide explains how domain-based marking generally works, how pass standards are usually set, and what examiners tend to reward, so you can train against the shape of the exam and then confirm the exact detail with your own school.

For the full picture of the exam itself, see our guide to the UKMLA CPSA and CPSA station types.

How is the CPSA marked, in general terms?

Across most UK medical schools, CPSA stations are marked using a structured checklist of observable behaviours, combined with a global or domain-level judgement from the examiner. Rather than one blunt pass/fail, your performance in a station is usually broken down into several skill areas, then combined into a station score. Those station scores are then aggregated, in some form, into an overall result for the assessment. The exact weighting, station count and aggregation method belong to your school, not to a single national scheme.

What are the CPSA marking domains?

Most CPSA-style mark schemes group behaviours into domain-like categories that map onto the GMC's expectations for a safe new doctor. These typically include something close to:

• Data gathering and clinical assessment — history taking, examination technique, and use of relevant investigations, focused on the task set.
• Clinical management and decision-making — reaching a safe, sensible plan, prioritising correctly, and recognising when escalation or urgent action is needed.
• Interpersonal and communication skills — structure, clarity, active listening, empathy, and shared decision-making with the patient.
• Professionalism — often marked separately or woven through the other domains, covering conduct, honesty, and patient safety behaviours.

The exact labels, number of domains, and how heavily each is weighted vary between schools. Some schools mark closer to three broad domains; others use more granular station-specific checklists. Treat the categories above as the shape of what is assessed, and check your own handbook for the precise structure.

Station-level pass standards vs the overall result

There are usually two layers to how a CPSA is judged:

1. Station-level standard. Each station has its own pass mark or threshold, set using a standard-setting method chosen by the school.
2. Overall assessment standard. Your results across all stations are combined into an overall result, which may involve an aggregate score, a minimum number of stations passed, or both.

Some schools allow strong performance in one station to compensate for a weaker one; others require you to reach the standard in a minimum number of individual stations regardless of your aggregate score. This distinction matters enormously for how you revise, so it is worth reading your assessment handbook specifically for this section rather than assuming it works like an exam you have sat before.

What is borderline regression, and does my school use it?

Borderline regression is a widely used method in OSCE-style assessment for calculating a defensible pass mark. In simple terms, examiners rate each candidate's overall performance in a station (for example, as clear pass, borderline, or clear fail) in addition to marking the checklist. The checklist scores of candidates rated "borderline" are then used to help calculate where the pass mark for that station should sit, rather than fixing the pass mark in advance.

Not every school uses borderline regression specifically, and some use variations or entirely different standard-setting approaches. The key point for your revision is this: pass marks in OSCE-style assessments are often derived from real examiner judgements of real candidates, not from an arbitrary fixed percentage, and they can shift slightly between sittings and station versions as a result. Your school's handbook will state which method it uses, if it publishes this level of detail.

Why CPSA marking varies by medical school

The GMC sets the MLA's overall content and outcome standards through the MLA content map and its published guidance, but it does not run a single national CPSA sitting or issue one national mark scheme. Each UK medical school is responsible for designing, delivering and marking its own CPSA so that it meets the GMC's required standard. That means:

• Station count, timing and circuit structure can differ between schools.
• The exact wording and structure of domain-based mark schemes differ between schools.
• Compensation rules (whether a strong station can offset a weak one) differ between schools.
• Standard-setting methods, including whether and how borderline regression is used, differ between schools.

This is not a loophole or an inconsistency to worry about; it reflects how the MLA is deliberately structured, with the GMC setting the bar and schools delivering the assessment. The practical implication for you is simple: general guidance like this article tells you the shape of CPSA marking, but your own school's assessment handbook is the only authoritative source for the specifics that will actually be applied to your result.

What do CPSA examiners actually reward?

Regardless of the exact mark scheme in front of them, examiners across UK schools tend to reward the same underlying things:

• A clear, safe approach, even under time pressure. Examiners are trained to notice whether you are working through a sensible structure, not reciting a script.
• Correct prioritisation. Identifying and acting on the most important issue in a station usually carries more weight than covering every possible point superficially.
• Genuine communication, not a checklist recited at the patient. Explanation, checking understanding, and responding to what the patient actually says are usually scored as part of the interpersonal domain.
• Professional behaviour, including how you handle uncertainty, sensitive information, and mistakes within the encounter.
• Patient safety. Missing a red flag or proposing something unsafe tends to cost disproportionately more than a minor factual gap, because the CPSA is ultimately checking you are safe to progress towards practice.

Checklist marks vs global judgement: how they interact

Most CPSA-style stations combine two different kinds of scoring, and understanding how they interact helps explain results that otherwise feel confusing.

Checklist marks are awarded for specific, observable actions: did you introduce yourself, did you ask about a particular symptom, did you offer analgesia, did you check the patient's understanding. These are relatively objective and reward thoroughness.

Global judgement is the examiner's overall impression of your performance in the station, often rated on a short scale from clear fail through borderline to clear pass. This is where structure, safety, prioritisation and how the encounter felt as a whole get captured, in a way a checklist alone cannot fully record.

Some students tick almost every checklist box yet still receive a lower global judgement, because the encounter felt disjointed, rushed, or mechanical rather than like a genuine clinical conversation. Others miss a checklist item but still come across as safe and competent overall. Because both elements typically feed into your final station score, ticking boxes is necessary but not sufficient. Aim for a consultation that would look convincing to a colleague watching, not just one that hits every line on a hidden list.

Common misconceptions about CPSA marking

A few beliefs about CPSA marking circulate among students each year that are worth correcting before they shape your revision:

• "One factual slip will fail the station." In most mark schemes, a single minor error is weighed against your overall performance in that domain, not treated as an automatic fail. What tends to matter far more is a pattern of unsafe decisions or a missed red flag.
• "Talking constantly shows knowledge." Examiners are marking your clinical reasoning and communication, not how much you say. Silences while you think, or space for the patient to speak, are not penalised in themselves.
• "The mark scheme is identical to last year's cohort's." Stations, checklists and even standard-setting details can be updated between sittings as schools refine their assessments. Do not rely on second-hand accounts of "what came up" as a guide to how marking works this year.
• "A bad first station means the exam is over." Because most schools aggregate across stations, a single weak start does not have to define your overall result, provided you can reset and perform normally in the stations that follow.

Making sense of feedback after a CPSA sitting

If your school provides feedback after a CPSA sitting, whether that is a numerical breakdown, examiner comments, or a domain-level summary, it is worth reading closely rather than only checking your overall pass/fail outcome. Feedback that shows a consistent pattern (for example, safety-netting missed across several stations, or management plans lacking clear prioritisation) tells you exactly where to focus, and is far more useful than treating the result as one undifferentiated number. If your school does not provide detailed feedback by default, it is reasonable to ask your assessment or student support office whether more detail is available, particularly if you are preparing for a resit.

How to train against a mark scheme you cannot fully see

Because you will not usually see your own school's exact station-level mark schemes in advance, the most effective preparation is to train against the general shape of domain-based marking rather than trying to guess specific checklist items:

• Rehearse against the domain categories, not just topics. After each practice station, ask yourself separately: was my data gathering focused, was my management safe and prioritised, and was my communication genuinely patient-centred?
• Get feedback that separates domains. It is far more useful to know "your data gathering was strong but your safety-netting was missed" than a single pass/fail. Practising with structured, 3-domain-style feedback — for example using OSCE Revision's mock stations with domain-based examiner scoring — makes it much easier to see exactly where marks are being lost.
• Practise full circuits, not single stations. Since overall results are usually aggregated across stations, consistency matters as much as any single strong performance. Timed mock exams that run multiple stations back to back help build that consistency.
• Read your own school's handbook properly. Note the number of stations, whether there is a minimum-stations-passed requirement, and what standard-setting method (if stated) is used. This is the single highest-value thing you can do beyond general revision.

Final thoughts

There is no single CPSA mark scheme to memorise, because the CPSA is delivered by your medical school, not sat as one national exam. What you can rely on is the underlying shape: domain-based marking that rewards safe data gathering, sound clinical management, and genuine communication, aggregated across stations to reach an overall standard. Learn that shape, rehearse against it with proper feedback, and then check your own school's assessment handbook for the specific pass criteria that will apply to you. Start rehearsing against 3-domain examiner scoring on the UKMLA CPSA hub.

This article is general exam-preparation guidance, not clinical advice and not a substitute for your medical school's official assessment documentation. Always confirm exact marking criteria, pass standards and station numbers with your own school's assessment handbook, and follow current GMC and MLA guidance.