For your medical school interview, you will require knowledge about the structure of the NHS. Primary, secondary and tertiary care are levels of healthcare within the NHS and understanding the distinction between the different levels is important for your medicine interviews.
In this article, you will learn about the differences between primary, secondary and tertiary care and why these levels of healthcare are important within the NHS. You can also have a go at examplemedicine interview questions and read through model answers.
The Importance of Distinct Healthcare Levels in the NHS - Summary
These are different levels of healthcare, where primary care is the patient’s first point of contact with healthcare professionals. Secondary care is provided following a referral from primary care and when specialist treatment is required.
The higher levels of healthcare are tertiary and quaternary care. Tertiary care is used for complex health conditions like open heart surgery, and quaternary care entails experimental medicine for very rare diseases.
Levels of healthcare are crucial to ensure that the NHS provides cost-effective and efficient care. It also allows for continuity and coordination of care to occur.
An increase in waiting times, shortage of NHS staff and a lack of communication between the levels of care can prevent effective healthcare delivery.
A lack of integration and communication between the levels of healthcare can be improved through Integrated Care Systems (ICSs), shared electronic patient records and care coordinators. The 2025 NHS 10-Year Health Plan (Fit for the Future, published July 2025) aims to shift more care out of hospitals and into the community through neighbourhood health, which makes understanding how these levels connect more relevant than ever for interviews.
What Is Primary Care? NHS GP Services Explained
Primary care within the National Health Service (NHS) serves as the initial point of contact for individuals seeking medical attention in the United Kingdom. This encompasses many services in the NHS, but for the context of medical school interviews, we will largely focus on GP Surgeries.
The main goal of primary care is to treat and prevent disease from occurring. Primary care providers, such as GPs, can prescribe medication to treat these illnesses and can suggest preventive measures to reduce the risk of the patient becoming unwell again.
Another goal of primary care is to manage chronic conditions. Some patients may have regular check-ups with their GPs within the GP practice to monitor their long-standing health conditions (eg, asthma, diabetes), and this allows for the development of a patient-doctor relationship.
Furthermore, GPs function as the principal gateway to specialised services within secondary care. Should a patient's condition necessitate specialist investigation or hospital-based treatment, the GP typically facilitates the referral. In this capacity, they are pivotal in guiding patients through the broader healthcare system and within social care. Read more here: The healthcare ecosystem - NHS England Digital.
NHS Primary Care Examples:
General Practices (GP surgeries): For routine consultations (e.g., for monitoring conditions like hypertension), assessment of new symptoms, and the ongoing management of health.
Community Pharmacies: Provide advice on minor ailments, manage repeat prescriptions, and offer services such as vaccinations and health checks.
Dental Practices
Optometry Services (Opticians)
NHS Walk-in Centres / Urgent Treatment Centres: For urgent medical concerns that do not appear to be life-threatening.
Problems in NHS Primary Care:
You need to know which issues can hinder the administration of primary care.
Increased demand for appointments and GP shortages
Time constraints: consultations can often run longer than the allocated 10-minute mark, leading to a backlog of patients
Greater complexity of healthcare, alongside an ageing population and a greater prevalence of chronic conditions, GPs are trying to manage a larger variety of health needs.
Community pharmacies now do more than ever: under the Pharmacy First service (launched January 2024), pharmacists can assess and treat seven common conditions (sinusitis, sore throat, earache, infected insect bite, impetigo, shingles and uncomplicated UTIs in women) without a GP appointment. 👉🏻 Read more: Pharmacy First Initiative
Interview coaching
Choose your 1-1 interview coaching package
Rated 5.0 from 550+ reviews. Practise with experienced interview experts: mock MMI and panel interviews, plus a free Ultimate Interview Q&A Guide (worth £349) with every coaching package.
Secondary care is provided when patients are referred to hospitals if they require specialised treatment or if they have a more complex disease that cannot be resolved by primary care. Secondary care can provide treatment, routine surgeries, rehabilitation, imaging and outpatient consultations with doctors.
The goal of secondary care is for specialists to use their expertise and knowledge to review and diagnose patients. They endeavour to support primary care providers by giving more specialised treatment for the patients’ conditions. They aim to provide continuity of care with primary care providers by devising treatment and care plans for the patient and helping manage the interface-between-primary-secondary-care.
Examples of NHS Secondary Care Services:
Accident and Emergency services
Specialist outpatient consultations (e.g. with neurologists, cardiologists, endocrinologists)
Mental health services (which can provide treatment for conditions like schizophrenia or depression)
Rehabilitation services (which can provide physiotherapy following injury or a stroke)
Problems in NHS Secondary Care:
Issues such as a lack of coordination of care between primary and secondary care can occur. There are also other problems like:
What Is Tertiary Care? (NHS Definition & Examples)
Tertiary care provides highly advanced care for complex and rare conditions that could not be resolved at the levels of primary and secondary care. Tertiary care utilises pioneering technology to treat severe or rare health conditions.
The goal of tertiary care is to provide specialised care for patients who have life-threatening conditions, such as advanced-stage cancer or severe burns. Tertiary care also entails complex surgeries such as open-heart surgery or organ transplants.
Many tertiary care centres are involved in teaching medical students and act as research centres, where they can contribute to further medical innovation.
Tertiary Care NHS Examples:
Intensive care units (neonatal or acute medical units)
Specialised surgeries (neurosurgery, organ transplants, open heart surgery or surgery for cancer)
Cancer units (which provide treatment like radiotherapy or immunotherapy)
There is also a fourth, more unusual level of care called quaternary care that you should also be aware of. This is only used for the rarest and most complex medical conditions.
Quaternary care aims to provide highly specialised treatments for patients with rare illnesses that cannot be treated with tertiary care. Quaternary care involves experimental medicine and conducting clinical trials for drugs and treatments that are still being researched.
Quaternary Care NHS:
Pioneering cancer centres (such as those that offer CAR-T-cell therapy for lymphomas and leukaemias)
Clinical trials for new drugs
Robotic surgeries
Multi-organ transplants
Interview coaching
Preparing for your medical school interviews?
1-1 coaching with experienced interview experts
Mock MMI and panel interviews, with personalised feedback
A free Ultimate Interview Q&A Guide (worth £349) with every coaching package
Why Are the Levels of Healthcare Important in the NHS?
Referral Pathways and the GP Gatekeeper Role
How the NHS 10-Year Health Plan Is Reshaping the Levels of Care
The government's 10-Year Health Plan for England, Fit for the Future, was published in July 2025 and is built around three shifts: from hospital to community, from analogue to digital, and from sickness to prevention. The first of these, often called the left shift, is the most relevant to the levels of healthcare, because it deliberately moves activity away from secondary care and towards primary and community settings.
A central idea is neighbourhood health: bringing GPs, nurses, pharmacists, social care, mental health and other professionals together in local teams and neighbourhood health centres that are open longer hours. The aim is to strengthen the front door of the NHS so that fewer patients need to be referred up to hospital, while integrating care across the levels through Integrated Care Systems and shared digital records. Initiatives like Pharmacy First, which lets pharmacists treat seven common conditions without a GP appointment, are early examples of this direction of travel.
In an interview, you can use this to show current awareness. A good line is that the NHS is trying to flip the balance between the levels of care, treating more people in primary and community settings to ease pressure on overstretched secondary and tertiary services. You could then weigh up the challenges, such as workforce shortages in general practice and the funding needed to build genuine community capacity.
Patients normally move up the levels through referral, and the GP sits at the centre of this as the system's gatekeeper. In my experience as a GP, most problems are managed entirely in primary care; only when a condition needs specialist assessment, investigation or treatment do I refer into secondary care, and a hospital specialist will in turn refer on to a tertiary centre if the case is complex or rare. This stepwise pathway is a defining feature of the NHS.
The gatekeeper role protects patients and the system. It directs people to the right level of care, prevents unnecessary and expensive hospital appointments, and keeps specialist capacity for those who genuinely need it. A&E is the main exception: patients can access emergency secondary care directly without a referral. A tertiary referral (sometimes called a specialist or super-specialist referral) means sending a patient on to a centre with expertise and equipment that a general hospital does not have, for example a regional neurosurgery or transplant unit.
For interviews, it is worth knowing that this model is changing. The 2025 NHS 10-Year Health Plan wants to shift care from hospital to community, expand the role of community pharmacy, and build neighbourhood health teams so that more people are looked after closer to home rather than being referred into hospital. A strong candidate can describe the traditional referral pathway and then comment on how policy is trying to reshape it.
Understanding and knowing which level of healthcare a patient should be referred to is crucial for many reasons. The levels of healthcare are crucial within the NHS for:
Efficient referral of patients: it allows patients to be directed to the level of healthcare that is best suited to their medical needs
Improves patient outcomes: it allows early detection and preventative measures to be taken
Allows for continuity of care: it allows patients’ treatment to be smoothly transferred from primary care to higher levels, which is useful for the management of chronic diseases
Cost-effective: it prevents the usage of more expensive and valuable resources on minor illnesses, so it allows the condition to be managed according to its severity.
Integration of care allows for coordination of care between the various levels
Integration of Care In The NHS: What can be done to improve this?
The levels of healthcare allow for the integration and continuity of care to occur. We can consider different ways in which we can improve the integration of healthcare across the different levels of healthcare.
Use of Integrated Care Systems (ICSs) and their Integrated Care Boards (ICBs), which link NHS organisations, councils and other partners across a region to plan care and focus on population health
Using shared electronic patient records - this allows communication across the different levels of healthcare and allows patient information to be continuously updated.
Use of NHS care coordinators - this can be used for patients with multiple health conditions and for patients who require more specialised treatment. A care-coordinator is a single person who can be used a point of contact for that particular patient.
Differences Between Primary, Secondary and Tertiary Care
Quick comparison: primary vs secondary vs tertiary care
The simplest way to remember the levels is by who you see, where, and how you get there. Primary care is the first point of contact, delivered in the community (GP surgery, pharmacy, dentist, optician), and you self-refer. Secondary care is specialist, hospital-based care (A&E, outpatient clinics, planned surgery) that you usually reach by GP referral. Tertiary care is highly specialised care for complex or rare conditions (cancer centres, neurosurgery, transplant units), accessed by referral from secondary care.
Primary care: who = GP, practice nurse, pharmacist, dentist, optometrist; where = community; access = self-referral; example = a GP managing your asthma. Secondary care: who = hospital specialists; where = general or district hospital; access = referral (or A&E for emergencies); example = a cardiology outpatient clinic. Tertiary care: who = super-specialists; where = specialist regional centres; access = referral from secondary care; example = a specialist cancer centre delivering radiotherapy. Quaternary care: who = research-led specialists; where = a handful of national centres; access = referral; example = CAR-T cell therapy or multi-organ transplantation.
Primary Care - the first point of contact with healthcare professionals
Secondary Care - hospital-based specialist treatment, normally accessed by referral from primary care
Tertiary Care - advanced care involving complex surgeries
Quaternary care involves experimental medicine for very rare conditions
Rated 5.0 from 550+ reviews. Practise with experienced interview experts: mock MMI and panel interviews, plus a free Ultimate Interview Q&A Guide (worth £349) with every coaching package.
How to answer medical school interview questions on primary, secondary and tertiary care in the NHS
In your medical school interview, knowing these different levels of healthcare can impress your interviewer, as it shows that you are aware of how healthcare is structured within the NHS.
When answering interview questions, demonstrate an understanding of the differences between healthcare levels and their respective functions. You should also show an understanding of why having these different levels of healthcare is important for the NHS.
You could also consider reflecting on your own work experience and volunteering, and linking this to the question. For example, if you have shadowed doctors in a general practice and in a hospital, you could explain how more specialised treatment was provided within the hospital setting.
You could consider other examples in a GP setting, where a patient is referred to a specific department of the hospital. In this scenario, you could explain how this escalation enables the patient to seek the appropriate care according to their medical needs and how it facilitates continuity of care.
Primary, Secondary and Tertiary Care: Model Medicine Interview Question and Answer
Can you please explain why separate levels of healthcare are implemented in the NHS?
There are different levels of healthcare in the NHS. Primary care is the patient’s first point of contact with healthcare professionals and can be used to treat, manage and prevent illness. Examples of this would be in the General Practice, walk-in centre or opticians.
Secondary care occurs when more specialised treatment is required and occurs on a referral basis. Tertiary care provides advanced treatment, such as open heart surgery or cancer treatment. Quaternary care is used for very rare health conditions and involves experimental medicine and clinical trials.
Separate levels of healthcare are used as they allow for efficient treatment of patients and enable patients to be directly seen by the relevant healthcare professional. Therefore, this allows for patients to be streamlined to the appropriate level of healthcare.
Implementing the levels of healthcare is also more cost-effective and enables integration of care to occur. Patient care is transferred from one level to another, which allows for continuity and coordination of care.
During my GP shadowing, I saw how primary care manages a vast range of issues and acts as the crucial first step. I observed a GP referring a patient with complex heart symptoms to a cardiologist, demonstrating the gateway role to secondary care.
Primary care is the first point of contact people have with the NHS, delivered in the community rather than in hospital. It includes GP surgeries, community pharmacies, dentists, optometrists (opticians) and walk-in or urgent treatment centres. Patients normally access primary care directly, without a referral. Its main roles are treating common illnesses, managing long-term conditions and providing preventive care, and the GP acts as a gateway to specialist services.
What is secondary care?
Secondary care is specialist, hospital-based care that patients usually reach by referral from a GP. It covers general hospital services such as outpatient clinics with specialists (for example cardiologists or neurologists), planned surgery, imaging, rehabilitation and mental health services. Accident and Emergency (A&E) is also secondary care, but it can be accessed directly without a referral. The role of secondary care is to provide expertise and treatment that primary care cannot.
What is tertiary care?
Tertiary care is highly specialised treatment for complex, severe or rare conditions that cannot be managed in primary or secondary care. It is delivered in specialist regional centres and is normally accessed by referral from secondary care. Examples include specialist cancer centres, neurosurgery, organ transplantation, severe burns units and specialist children's hospitals. These centres often use advanced technology and are involved in teaching and research.
What is quaternary care?
Quaternary care is an even more specialised extension of tertiary care, reserved for the rarest and most complex conditions. It is provided in a small number of national centres and often involves experimental medicine and clinical trials. Examples include CAR-T cell therapy for some blood cancers, multi-organ transplantation and pioneering robotic surgery. Not all sources use the term, so in an interview it is enough to know it means ultra-specialised, often experimental, care.
What is the difference between primary and secondary care?
The main differences are specialisation and how you access them. Primary care is the first point of contact, delivered in the community by generalists such as GPs, and you can usually access it directly. Secondary care is specialist, hospital-based care, normally accessed by referral from primary care (A&E being the exception). In short, primary care manages and prevents everyday illness, while secondary care provides specialist diagnosis and treatment.
What is the difference between secondary and tertiary care?
Secondary care is general hospital-based specialist care, such as outpatient clinics, A&E and routine surgery, usually accessed by GP referral. Tertiary care is more highly specialised care for complex or rare conditions, delivered in dedicated regional centres and accessed by referral from secondary care. For example, a district hospital cardiology clinic is secondary care, whereas a specialist heart transplant centre is tertiary care.
What is the difference between primary, secondary and tertiary care?
Primary care is your first point of contact in the community (GPs, pharmacists, dentists, opticians), accessed directly. Secondary care is hospital-based specialist care, usually accessed by referral (outpatient clinics, A&E, planned surgery). Tertiary care is highly specialised care for complex or rare conditions in dedicated centres, accessed by referral from secondary care (cancer centres, neurosurgery, transplants). Patients move up the levels mainly through referral, with the GP acting as gatekeeper.
What are examples of primary care?
Examples of primary care include GP surgeries (for consultations and managing long-term conditions such as diabetes and asthma), community pharmacies (advice, repeat prescriptions, vaccinations and Pharmacy First treatments), dental practices, optometry services (opticians), and NHS walk-in centres or urgent treatment centres for non-life-threatening urgent problems. All of these are community-based and can usually be accessed without a referral.
What are examples of secondary care?
Examples of secondary care include Accident and Emergency (A&E) departments, specialist outpatient clinics (such as cardiology, neurology or endocrinology), planned and routine surgery, diagnostic imaging, hospital-based mental health services, and rehabilitation services such as physiotherapy after a stroke or injury. Most secondary care is accessed by referral from a GP, although A&E can be accessed directly in an emergency.
What are examples of tertiary care?
Examples of tertiary care include specialist cancer centres providing radiotherapy or immunotherapy, neurosurgery, organ transplant units, cardiothoracic surgery (such as open-heart surgery), severe burns units, specialist children's hospitals and intensive care units. These services treat complex, severe or rare conditions and are usually concentrated in a few regional centres that patients reach by referral from secondary care.
Is a hospital primary or secondary care?
A hospital is generally classed as secondary care, because it provides specialist services accessed by referral, such as outpatient clinics, A&E and surgery. However, some hospitals also provide tertiary care through highly specialised units (for example transplant, neurosurgery or cancer centres). Care delivered in the community, such as your GP surgery, is primary care, not hospital care.
What is a tertiary referral or tertiary centre?
A tertiary referral is when a hospital specialist refers a patient on to an even more specialised centre, because the case is too complex or rare for a general hospital. A tertiary centre (or tertiary care centre) is the hospital or unit that provides this highly specialised care, for example a regional neurosurgery, transplant or specialist cancer centre. Tertiary centres often have advanced technology and a teaching and research role.
What is the role of the GP as a gatekeeper?
The GP gatekeeper role means most patients must be seen and assessed in primary care before being referred to specialist secondary care. This protects patients by directing them to the right level of care, and protects the NHS by preventing unnecessary, expensive hospital appointments and preserving specialist capacity. A&E is the main exception, as it can be accessed directly. The gatekeeper model is central to how the NHS manages demand.
Why are the levels of healthcare important in the NHS?
The levels of healthcare let patients be directed to the care best suited to their needs, which improves outcomes, supports early detection and prevention, and is more cost-effective because expensive specialist resources are reserved for those who need them. They also support continuity and integration of care, with patient information and treatment passing smoothly between primary, secondary and tertiary services through referrals and shared records.
How is the 2025 NHS 10-Year Health Plan changing the levels of care?
The NHS 10-Year Health Plan for England (Fit for the Future, July 2025) aims to shift care from hospital to community, from analogue to digital, and from sickness to prevention. For the levels of care, the key change is the left shift: treating more people in primary and community settings through neighbourhood health teams and expanded pharmacy services, so fewer patients need referral into secondary and tertiary care.
How should I answer a medicine interview question on the levels of care?
Start with a clear definition of each level (primary, secondary, tertiary and quaternary) with a concrete example. Then explain the referral pathway and the GP gatekeeper role, and why having distinct levels matters (efficiency, cost-effectiveness, continuity of care). Strengthen your answer by linking to work experience, for example seeing a GP refer a patient to hospital, and by showing current awareness of the shift from hospital to community in the 2025 10-Year Health Plan.
Ultimate Package students from our 2025/26 cycle, with their UCAT scores and offers, who trained with us for the UCAT, personal statements and interviews.
Ultimate Package
S
Sophie
Medicine, King's College London
2025 UCAT2,590 / 2,700
“Harry got my UCAT up to 2,590, working through the sections I kept dropping marks on week by week. Gemma then ran my interview practice so the MMI stations didn't catch me out, and Dr Akash mentored me the whole way through. I'm off to King's for Medicine.”
Ultimate Package
D
Daniel
Medicine, University College London
Medicine offers4 offers
“The interview prep was the part that actually moved the needle. Proper mock MMIs, not just lists of questions, and feedback that was honest about what I was getting wrong. I ended up with four offers and firmed UCL.”
Ultimate Package
A
Aisha
Dentistry, University of Birmingham
Dentistry offers4 offers
“The Ultimate Package kept me organised from UCAT through to interviews. They knew what dental schools actually ask and tightened up my personal statement. Four offers in the end, and I'm going to Birmingham.”
Ultimate Package
C
Charlotte
Veterinary Medicine, Royal Veterinary College
Vet offers4 offers
“Vet applications come down to the written SAQs as much as the interview. Dr Rebecca went through my SAQs line by line, sharpened my answers and prepped me for the panels. I came away with four offers and chose the RVC.”
