When a GP has 90 seconds between patients and needs to check whether the blood pressure threshold for treatment has changed in the latest NICE guidance, or when a Foundation doctor on a night shift needs to quickly verify the acute management of hyperkalaemia, the tool they reach for is not a textbook. It is a point-of-care reference — a resource designed to deliver the right clinical answer, from a trusted source, in the time available.
In UK clinical practice, three resources dominate this space: BMJ Best Practice, NICE Clinical Knowledge Summaries (CKS), and iatroX. Each has a fundamentally different model for access, content, and delivery. Understanding those differences is the key to choosing the right one — or, more realistically, the right combination.
BMJ Best Practice: The Premium, Institution-Gated Reference
What It Is
BMJ Best Practice is a clinical decision support tool that provides structured, evidence-based summaries for over 1,500 conditions. It covers diagnosis, treatment, prognosis, and follow-up, with information organised by clinical question: "What is it? How do I diagnose it? How do I treat it? What happens next?" Each topic includes a differential diagnosis tool, evidence appraisals, and patient information resources.
Strengths
The content quality is outstanding. BMJ Best Practice is written and reviewed by clinical experts, structured for point-of-care use, and regularly updated. Its differential diagnosis tool is genuinely useful for working through ambiguous presentations. The treatment sections provide clear, evidence-graded recommendations.
Coverage is international. While it includes UK-specific content, it also covers US, European, and international guidelines, making it useful for clinicians who work across jurisdictions or who want to understand how management varies globally.
The interface is well designed for clinical workflow. Information is layered so you can get a quick answer at the top level or drill into detailed evidence if you have more time.
Limitations
It is institution-gated. BMJ Best Practice is not free for individual clinicians. Access is available through NHS trust subscriptions (via OpenAthens login), university licences, or personal subscriptions. If your trust subscribes, it is free to you. If it does not, you cannot access it. This creates an equity problem: the tool is excellent, but not universally available.
It is not conversational. You search for a condition, navigate to the relevant section, and read. This is effective but slower than asking a natural-language question and receiving a direct answer.
It is broader than UK-specific. For clinicians who primarily need UK guidance (NICE, CKS, SIGN, BNF), the international breadth can sometimes mean navigating past non-UK recommendations to find the one that applies to their practice.
Best For
Hospital-based clinicians with OpenAthens access who need detailed, multi-section condition summaries. Clinicians who want international perspective alongside UK guidance. Those who value the differential diagnosis tool for working through complex presentations.
NICE CKS: The Free, Definitive UK Primary Care Reference
What It Is
NICE Clinical Knowledge Summaries (CKS) provides practical, evidence-based summaries of common conditions encountered in UK primary care. Each topic covers background, diagnosis, management, prescribing, referral, and follow-up, grounded explicitly in NICE guidance. CKS is free, publicly accessible, and maintained by NICE.
Strengths
It is the definitive UK primary care reference. CKS is the single most authoritative source for GP-level clinical guidance in the UK. Every topic is directly linked to NICE guidelines, and the summaries are designed for the specific context of UK general practice.
It is free and universally accessible. No login, no subscription, no institutional affiliation required. Every clinician, student, and pharmacist in the UK can access it.
The content is highly structured. The "Scenario" format — which organises guidance by clinical situation rather than just by condition — is particularly useful for primary care decision-making.
Limitations
It is not conversational. CKS is a traditional web-based reference. You navigate to a topic, find the relevant section, and read. There is no natural-language query interface. This means you need to know which topic to search for and which section contains your answer — which is fine when you know what you are looking for, but less helpful when your question is ambiguous or crosses topic boundaries.
Navigation can be slow under time pressure. CKS topics are comprehensive, which means finding a specific recommendation within a long page can take time. When you have 30 seconds between patients, scrolling through a full CKS topic is not always practical.
Coverage is primary care focused. CKS does not cover every condition or every clinical context. Hospital-specific protocols, secondary care pathways, and specialist management are outside its scope.
It is text-only. No adaptive learning, no Q-bank, no CPD tracking. CKS is a reference tool and only a reference tool.
Best For
UK GPs, GP trainees, practice nurses, and clinical pharmacists who need the definitive UK primary care guidance. First port of call for any question about condition management in general practice. The baseline that every other tool should be checked against.
iatroX: The Free, AI-Powered, Citation-First Clinical Reference
What It Is
iatroX is a free, UKCA-marked, MHRA-registered AI clinical reference platform that uses retrieval-augmented generation (RAG) over a curated corpus of NICE, CKS, SIGN, and BNF guidelines, supplemented by peer-reviewed research. Its Ask iatroX feature accepts natural-language clinical questions and returns citation-first answers with direct links to primary sources.
Strengths
It is conversational. You ask a question in natural language — "What is the NICE-recommended first-line treatment for newly diagnosed hypertension in a 55-year-old?" — and receive a direct answer with a citation. This is fundamentally faster than navigating CKS or BMJ Best Practice when your question is specific.
Every answer is citation-first. iatroX does not generate unsourced summaries. Every answer includes visible links to the guideline or research that supports it. You can verify in one click. This is architecturally different from general-purpose AI tools like ChatGPT, which generate plausible text without source verification.
It is completely free. No institutional login, no subscription, no trial period, no professional verification required. Any clinician, student, pharmacist, or healthcare professional can use it immediately.
It goes beyond reference. iatroX includes a Knowledge Centre for structured browsing of UK guidelines, a Brainstorm tool for clinical reasoning, an adaptive Q-Bank for learning, and a CPD module for professional development. This makes it a platform rather than a single-function reference tool.
It is UK-first. The knowledge base is built around NICE, CKS, SIGN, and BNF — the sources that govern UK clinical practice. The answers you receive are grounded in the guidelines that apply to your patients.
Limitations
It is AI-generated, not hand-written. While grounded in verified sources via RAG, the synthesis is performed by an AI model. This means you should still follow the citation to confirm the primary source for high-stakes decisions, just as you would verify any reference tool.
Coverage depth varies by topic. For mainstream primary care conditions, iatroX's coverage is strong. For rare conditions or highly specialist questions, you may need to go directly to specialist society guidelines or resources like BMJ Best Practice.
It is newer than the established alternatives. CKS has decades of track record. BMJ Best Practice has deep institutional trust. iatroX is building its evidence base — including a published evaluation study on arXiv — but it is earlier in its adoption curve.
Best For
UK clinicians who want fast, guideline-grounded answers to clinical questions during busy clinics. GPs, trainees, foundation doctors, clinical pharmacists, and physician associates who need a free, conversational reference tool that shows its sources. Anyone who wants the speed of a conversational AI with the reliability of curated guidelines.
How They Compare: A Side-by-Side View
Access model. BMJ Best Practice is institution-gated. CKS is free. iatroX is free.
Query interface. BMJ Best Practice uses topic search and navigation. CKS uses topic search and navigation. iatroX uses natural-language conversational query.
Primary knowledge base. BMJ Best Practice draws from international evidence and guidelines. CKS draws from NICE guidance. iatroX draws from NICE, CKS, SIGN, BNF, and peer-reviewed research.
Citations and provenance. BMJ Best Practice provides evidence references within topics. CKS links directly to NICE guidelines. iatroX provides inline citations with direct links to primary sources in every answer.
Speed to answer. BMJ Best Practice requires navigation (moderate). CKS requires navigation (moderate). iatroX provides a direct conversational answer (fast).
Additional features. BMJ Best Practice offers differential diagnosis tools and patient leaflets. CKS is reference-only. iatroX offers a Knowledge Centre, Brainstorm clinical reasoning, Q-Bank with spaced repetition, and CPD module.
Cost. BMJ Best Practice is free via institution or paid individually. CKS is free. iatroX is free.
Regulatory status. BMJ Best Practice is a trusted clinical resource. CKS is maintained by NICE. iatroX is UKCA-marked and MHRA-registered as an informational tool.
The Practical Recommendation: Use Them Together
These tools are not competitors in the way that exam Q-banks compete with each other. They serve different functions within the same clinical workflow.
Use CKS as your authoritative baseline. When you need the definitive UK primary care guidance for a condition, CKS is the source of truth. Bookmark the topics you access most frequently.
Use iatroX as your fast conversational interface. When you need a specific answer to a specific question in 15 seconds between patients, Ask iatroX is the fastest route to a guideline-grounded, citation-first answer. Follow the citation to CKS or NICE when you need the full detail.
Use BMJ Best Practice when you have it and need depth. If your trust provides access, BMJ Best Practice is excellent for detailed condition summaries, differential diagnosis, and international perspective. Use it when you have more time — during teaching, case preparation, or complex clinical reasoning.
Use iatroX's broader platform for learning and CPD. The Q-Bank, Brainstorm, and CPD module turn your point-of-care reference into a learning platform. No other reference tool in this comparison offers this.
Conclusion
The best point-of-care reference for UK clinicians in 2026 is not a single tool. It is a combination that matches the pace, depth, and context of your clinical day.
CKS is the authoritative baseline. iatroX is the fast, free, conversational front door that also supports learning and professional development. BMJ Best Practice is the premium depth layer when you have institutional access and time to use it.
Start with what is free and accessible — CKS and iatroX. Add BMJ Best Practice if your trust provides it. And build the habit of checking, verifying, and learning from every clinical query. That habit matters more than any individual tool.