What Happens During NHS Referral Triage?

Step 1 — Referral submission

1. 1

   GP writes the referral

   Usually during or shortly after your appointment, the GP composes a referral letter setting out your history, examination findings, current medication, relevant test results, and the specific clinical question for the specialist.

2. 2

   Electronic transmission

   Most referrals go via the NHS e-Referral Service (e-RS), which sends the letter directly to the receiving provider's electronic queue. Some specialties (mental health, certain community services) still use letter or fax.

3. 3

   Receipt and acknowledgement

   The receiving provider's referral management team logs the referral onto the patient administration system (PAS). The RTT clock starts at this point — the day the referral was received, not the day you saw your GP.

Step 2 — Admin processing

Before any clinical eye sees the letter, an administrative reviewer checks it for completeness and routing. They're not making clinical decisions — they're catching obvious operational problems early.

• Is the referral addressed to a service this provider actually offers?
• Are your demographic details correct (NHS number, address, contact)?
• Is the basic clinical information present (reason for referral, urgency band requested)?
• Are any locally required attachments included (recent bloods, BMI for surgical pathways)?

If the basics check out, the referral moves to the clinical triage queue. If something obvious is missing, it can be returned at this stage without ever reaching a consultant.

Step 3 — Clinical review

This is the heart of triage. The referral is opened by a triage clinician — usually a consultant on the rota for that day, sometimes a specialist nurse or physiotherapist under protocol. They read the GP letter, look at any attached results, and make a clinical judgement about the case.

Step 4 — Pathway routing

Once accepted in principle, the triage clinician decides which pathway you belong on. This is more than just "outpatient clinic" — it includes urgency, sub-specialty, and whether any diagnostic step should happen first.

• Routine outpatient. The default for most non-urgent referrals.
• Urgent outpatient. Faster than routine but not the formal 2-week-wait pathway.
• 2-week-wait (cancer). Strict national pathway with appointment within 14 days.
• Diagnostic-first. Test before clinic visit (common in gastroenterology, urology, cardiology).
• Sub-specialty. Routed to the right specialist within the team (e.g. shoulder vs hip in orthopaedics).

Step 5 — Diagnostics requests

Many triage decisions involve a diagnostic test before the consultant visit. This avoids the inefficient pattern of a clinic visit, an order for a test, a wait, and then a second visit. Triage-initiated diagnostics typically include MRI or CT, ultrasound, endoscopy, sleep studies, echocardiography, or specialist blood panels.

The downside is that the diagnostic queue itself becomes part of your wait. The upside is that when you do see the consultant, the conversation is meaningful — they're looking at results, not ordering them.

Step 6 — Prioritisation

1. 1

   Urgency band assigned

   Routine, urgent or 2-week-wait. Each band feeds a separate booking queue.

2. 2

   Within-band ordering

   Inside each band, patients are usually booked in the order their referrals were received — adjusted for any clinical priority reviews.

3. 3

   Clinic capacity allocation

   The booking team matches each waiting patient to the next available consultant slot in the right sub-specialty and urgency band.

Step 7 — Rejection or redirection

Not every referral is accepted onto the local pathway. Common alternative outcomes:

• Redirected to a more appropriate service — often a community clinic, a different specialty, or a diagnostic-first pathway.
• Held pending information — a "please provide" letter to the GP asking for specific items.
• Rejected with a stated reason — usually missing information, falling outside locally agreed criteria, or being something for primary care.

For the practical fix in each case, see why an NHS referral might be returned or redirected and can an NHS consultant reject a referral.

Realistic timelines

1. Cancer (2-week-wait) referrals — usually triaged within 24 hours and booked within 14 days of receipt.
2. Urgent non-cancer referrals — typically triaged within 3–7 days.
3. Routine referrals — anywhere from a few days to 3–4 weeks for triage, then weeks or months for the booked appointment.
4. "Please provide" loops — can add 2–6 weeks depending on how quickly your GP responds.
5. Diagnostic-first pathways — add the diagnostic queue length to the outpatient queue length.

Operational delays

• Specific consultant on leave who covers the triage rota that week.
• "Please provide" letters waiting for a GP response.
• Referrals batched for weekly or fortnightly triage meetings rather than triaged daily.
• Recently migrated patient administration systems creating short-term backlogs.
• Referrals temporarily mis-routed and waiting for clerical review.

What patients should realistically expect

Practical next steps

You can also check where your wait stands against the 18-week target with our free calculator, and if needed escalate through PALS — the hospital's patient advice service.