Medical Microbiology Portfolio Pathway: a complete guide for senior doctors.

The medical microbiology route in brief

Medical microbiology reaches the Specialist Register by the same two routes as every specialty: a Certificate of Completion of Training (CCT) at the end of UK training, or the Portfolio Pathway for doctors who have not completed a UK approved programme but can demonstrate equivalent knowledge, skills and experience. If you are new to the route, start with the complete guide to the Portfolio Pathway; this article assumes that grounding and focuses on what is specific to medical microbiology.

What makes microbiology distinctive among the specialties in this library is how much of its clinical work is advisory. A medical microbiologist runs and authorises the diagnostic laboratory and, at the same time, is the person every other team in the hospital phones about infection: which test to send, how to interpret it, what to prescribe, how to manage an outbreak. The specialty also owns infection prevention and control and antimicrobial stewardship, two of the most important patient-safety agendas in the modern NHS. The evidence has to capture all of that, and much of it is the kind that disappears if you do not deliberately record it.

The spine of your application is the General Medical Council (GMC) Specialty Specific Guidance (SSG) for Medical Microbiology, read alongside the 2021 medical microbiology curriculum from the Royal College of Pathologists (RCPath), which incorporates combined infection training. Read both before gathering anything. We explain how to read an SSG in general in the SSG guide.

For many senior SAS doctors and non-substantive consultants already working at a microbiology specialty level in the UK, the reassuring point is that you are probably generating all four pillars of evidence every week without recording them. If you authorise reports, give ward and telephone advice, sit on the infection prevention committee and lead stewardship work, the consultant-shaped practice is already there. The Portfolio Pathway is then less about acquiring new experience and more about capturing, organising and mapping what you already do. The rest of this guide is largely about how to do that capture well, because in microbiology it is the difference between a thin portfolio and a convincing one.

The four pillars

The clearest way to think about a medical microbiology portfolio is as four pillars, each of which the assessors expect to see evidenced. Picture them as the framework the whole application hangs on.

These specialty pillars sit alongside the generic professional capabilities shared across medicine. The underlying logic of Capabilities in Practice, and how to map evidence to them, sits in the Capabilities in Practice guide, within the four GMC domains.

The laboratory and the advisory clinical roles

Like haematology, microbiology straddles the laboratory and the clinical, but the clinical role has a different character: it is largely consultative. You are not usually the admitting clinician who owns the patient, you are the expert the admitting team relies on. Evidencing this advisory role well is the single biggest difference between a strong and a weak microbiology portfolio.

If your background is strong on the laboratory but light on clinical liaison, or vice versa, plan deliberately to build the thinner side. The dedicated guide on the laboratory and clinical balance goes deeper on how to do that, including how overseas applicants whose practice was purely laboratory can build the advisory evidence inside a UK post.

FRCPath: the mandatory examination

For medical microbiology the qualification requirement is firm. FRCPath in Medical Microbiology is the standard qualification, with Part 1 in Infection assessing the core body of knowledge and Part 2 testing practical skills and understanding. For the Portfolio Pathway you need FRCPath, or clear evidence of a comparable qualification and standard, so it is the first thing to confirm.

Not a GIM application, and the ten-year window

Two structural points distinguish microbiology from the medical specialties. First, it is a pathology specialty, entered through combined infection training rather than the standard internal medicine route, so it is not a dual application with General Internal Medicine. The medical knowledge base is assessed through that training and the FRCPath, not through an ongoing general medical take. The dual nature of microbiology is internal, between the laboratory and the advisory clinical roles.

Second, and usefully, the currency-of-evidence rules differ. Pathology specialties including medical microbiology generally accept evidence from the last ten years, a longer window than the five-year expectation common in many clinical specialties, although a small amount of older evidence can be considered where it completes the picture of breadth. The bulk should still be recent and give current assurance, but the longer window can help you evidence the full scope of the specialty, including outbreaks or unusual cases from earlier in your career.

Capturing advisory evidence: the central challenge

Here is the problem every microbiology applicant faces. You give expert infection advice dozens of times a day, you run stewardship rounds, you manage outbreaks, you write guidelines, and almost none of it leaves a natural paper trail. Unlike a procedural specialty with a logbook, microbiology evidence has to be deliberately constructed. The good news is that there are recognised ways to do it.

The discipline is to capture as you go rather than reconstruct at the end. Keep a contemporaneous log of significant advice episodes and stewardship interventions, write up the most instructive as case-based discussions, and keep copies of the guidelines, outbreak reports and audits you contribute to. A microbiologist who does this for two years has a rich, credible portfolio; one who tries to assemble it retrospectively from memory has a thin one.

What evidence you need

The four pillars sit within a complete application that maps across the whole curriculum using the same evidence types as every specialty. The table below is the working inventory.

The cross-specialty evidence types each repay being built deliberately. We cover the workhorses in depth: multi-source feedback, workplace-based assessments, audit, and structured reports and referees. An antimicrobial stewardship audit is a particularly efficient piece of evidence, because it touches the stewardship pillar, patient safety and governance at once.

Scope and breadth

Microbiology is broad in scope, and assessors look for evidence across its range rather than depth in only one area. A portfolio strong in diagnostics but thin in stewardship, or strong on advice but light on infection prevention, looks unbalanced against a curriculum built around all four pillars. Think across these areas and make sure each is genuinely represented.

It is worth reflecting the way the laboratory itself has changed, because assessors value evidence that you practise to a current standard. Molecular and genomic methods, rapid and point-of-care diagnostics, and whole-genome sequencing for outbreak investigation have transformed how a modern microbiology service works. Evidence that you select, interpret and advise on these newer methods, and that you use diagnostic stewardship to send the right test rather than every test, demonstrates contemporary practice rather than a textbook from a decade ago. It maps neatly onto the diagnostics pillar and signals that your knowledge base is current, which matters given the recency expectations.

The direct-clinical face of microbiology has also grown, and it is a strong source of evidence where you have it. Outpatient parenteral antimicrobial therapy (OPAT), complex infection clinics, and the joint management of bone and joint infection, endocarditis and infection in the immunocompromised increasingly bring microbiologists into ongoing patient care rather than one-off advice. If your post includes this kind of continuity, evidence it: it shows clinical depth beyond the advisory role and demonstrates the multidisciplinary working the curriculum expects, tying the laboratory and clinical pillars together in a single, well-documented thread.

If you have a defined special interest, whether that is virology, infection prevention, stewardship or a clinical area such as bone and joint or OPAT, lean into it as evidence of consultant-level depth, provided the general breadth is also there. The guide on special interest areas covers how to evidence one.

A realistic timeline

Most candidates take two to four years from starting evidence collection to Specialist Register entry. Microbiology rewards early, deliberate evidence capture more than almost any specialty, because the advisory work vanishes if not recorded. If you do not already hold FRCPath, the examination takes substantial preparation. The longer ten-year evidence window helps, but the breadth across the four pillars is genuinely demanding to assemble.

The processing time after submission is the same as for any specialty: the GMC's published guidance is six to twelve months to process before the Royal College evaluation, with the decision after that. Plan for roughly twelve to eighteen months from submission to outcome, on top of the evidence-building years. The full sequence is in the timeline guide, and what happens after you submit in the after-submission guide.

The biggest variable, as ever, is your post. A role giving you genuine laboratory responsibility, a clinical liaison and stewardship presence, and a part in infection prevention makes a complete application achievable. A purely laboratory post with no clinical-facing role, or the reverse, makes the missing pillars very hard to evidence. That is worth weighing honestly when you plan, and sometimes worth acting on.

Why microbiology applications stall

Related guides

Medical microbiology sits within the wider library of specialism overviews and the cross-cutting evidence guides. If you are still choosing or confirming your specialty, the guide on choosing your specialty helps. The full set of specialism overviews:

Build these alongside your application

The diagnostic and advisory evidence is specialty-specific, but the rest of the portfolio draws on the same cross-cutting evidence types as every application. Build these in parallel.

Frequently asked questions

Is medical microbiology a laboratory or a clinical specialty?

Both. A medical microbiologist runs and advises the diagnostic laboratory, authorising and interpreting results, and provides clinical advice on infection to colleagues across the hospital and to GPs. Alongside this sit infection prevention and control and antimicrobial stewardship. The clinical role is largely advisory and consultative rather than direct patient ownership. A Portfolio Pathway application must evidence the laboratory work, the clinical infection advice, infection prevention and control, and stewardship, because the curriculum is built around all four.

Do I need FRCPath in Medical Microbiology for the Portfolio Pathway?

Yes, effectively. FRCPath in Medical Microbiology is the standard qualification for the specialty, with Part 1 in Infection assessing core knowledge and Part 2 testing practical skills and understanding. For the Portfolio Pathway you need FRCPath or clear evidence of a comparable qualification and standard, so it is the first thing to confirm. The examination content, including laboratory management and antimicrobial stewardship, is a useful map of the breadth your evidence must also cover.

Is medical microbiology assessed with General Internal Medicine?

No. Medical microbiology is a pathology specialty, not a Group 1 medical specialty, so it is not a dual application with General Internal Medicine. Entry is through combined infection training rather than the standard internal medicine route, and the medical knowledge base is assessed through that training and FRCPath. You evidence laboratory and infection competence rather than an ongoing general medical take. The dual nature of the specialty is internal, between the laboratory and the clinical advisory roles.

What evidence does a medical microbiology Portfolio Pathway application need?

Evidence mapped to the curriculum capabilities across the four pillars: laboratory diagnostics and authorisation, clinical infection advice and liaison, infection prevention and control including outbreak management, and antimicrobial stewardship. Add the FRCPath, workplace-based assessments, multi-source feedback, audit and quality improvement, teaching and CPD, and structured reports. Much of the clinical work is advisory, so the challenge is capturing it: ward referrals, authorised reports, stewardship rounds, guidelines written and outbreaks managed all need to be documented and mapped.

How far back can my microbiology evidence go?

Pathology specialties including medical microbiology generally accept evidence from the last ten years, a longer window than the five-year expectation common in many clinical specialties, although a small amount of older evidence can be considered where it completes the picture of breadth. The bulk should still be recent and give current assurance. Confirm the exact position in your Specialty Specific Guidance, because the currency-of-evidence rules are defined there and matter to how you assemble the portfolio.

How long does the medical microbiology Portfolio Pathway take?

Most candidates take two to four years from starting evidence collection to Specialist Register entry. Microbiology often needs careful planning because so much of the clinical work is advisory and easy to leave uncaptured, and because the FRCPath takes substantial preparation if you do not already hold it. Once submitted, the GMC takes six to twelve months to process before the Royal College evaluation, with the decision after that. Plan for roughly twelve to eighteen months of process time on top of the evidence-building years.