How the NHS 18-week RTT pathway works

The 18-week Referral-to-Treatment (RTT) standard is the NHS England operational target that aims to start consultant-led treatment within 18 weeks of a GP referral for non-urgent elective care. The standard requires Trusts to deliver this for at least 92% of patients on an incomplete pathway. It was introduced in 2008 and is the headline metric used by NHS England to assess elective performance.

When the clock starts

Your 18-week clock starts on the day the NHS receives the referral — not when the GP signs it. For an e-Referral System (e-RS) referral this is the day the appointment is booked; for a paper or letter referral it is the day the receiving Trust's administration team records it. The exact start date is recorded on the patient's Trust record and is what NHS England audits.

What counts as “treatment”

The clock stops on the earliest of the following: first definitive treatment begins (e.g. operation date), an active monitoring decision is made and recorded, the patient is added to a planned-care list, the patient does not attend (DNA) and is discharged, or the clinician decides no treatment is appropriate. The clock does not stop for a diagnostic appointment, an outpatient consultation, or pre-op assessment.

Cancer pathways are separate

Patients referred under the urgent 2-week-wait suspected-cancer pathway are tracked separately and against different standards (the 28-day Faster Diagnosis Standard and the 62-day target to treatment) — not 18-week RTT. See our cancer 2-week-wait guide.

If you wait longer than 18 weeks

The 18-week standard is an operational target for NHS England — not an absolute legal right. Even so, if you have waited longer than 18 weeks and your case is non-urgent, you can: contact the Trust's Patient Advice and Liaison Service (PALS) to ask for an updated estimate; ask your GP to request a re-referral elsewhere using your Choose & Book entitlement; and check the procedure-specific median wait at alternative Trusts before re-referring. Some patients may also be eligible for treatment at an Independent Sector Treatment Centre (ISTC) under NHS contract.

How to find shorter-wait Trusts

PlainNHS publishes the median and 90th-percentile waiting time for each NHS procedure broken down by Trust. The data comes from the NHS England monthly RTT statistical release. Use the procedure index to pick your procedure, then sort the Trust column by median wait.

Sources

• NHS England, Referral-to-Treatment (RTT) Waiting Times - monthly statistical release.
• NHS England, RTT rules and guidance.
• The NHS Constitution for England (most recent version) - patient rights and pledges.

Common questions

Where can I find the official documentation? Each numbered source link above takes you to the canonical NHS England, NHS Digital, NICE, or CQC publication. PlainNHS does not paraphrase these documents at length — we point you to them and explain the practical implication for patients.

How often does the underlying guidance change? NHS operational standards (RTT, A&E, cancer) have been stable for several years but performance against them is published monthly. NICE guidelines are revised every 2-3 years on a published schedule. CQC's inspection methodology was last updated in 2024 and the new framework is now in force for all inspections.

What if my situation differs from what is described here? Always speak to your GP, NHS 111, or PALS at the treating Trust. The guidance on this page covers the standard pathway; individual cases can vary on clinical grounds, locality of services, and patient preference.

How PlainNHS uses this guidance

When we present operational performance data on a Trust profile (e.g. “a Trust achieved 76% on the 18-week RTT standard”), we are referring to the same standard described on this page. Reading this guide gives you the context to interpret the numbers correctly. The PlainNHS methodology describes how we compute and verify the figures.

Related guides on PlainNHS

• The NHS 18-week RTT pathway
• The cancer 2-week-wait pathway
• How to interpret CQC ratings
• Choose & Book — your right to choose your hospital
• The A&E 4-hour target
• NHS Continuing Healthcare eligibility
• When the NHS pays for private treatment
• How to make an NHS complaint

Glossary of terms used in this guide

• NHS Trust — a statutory NHS body that runs hospitals or other healthcare services for a defined catchment.
• Integrated Care Board (ICB) — the local NHS body that commissions (purchases) healthcare for a region; succeeded Clinical Commissioning Groups in 2022.
• Multidisciplinary team (MDT) — a clinical team combining specialists from different disciplines to plan an individual patient's care.
• e-RS (e-Referral Service) — the NHS digital booking system that replaces paper referrals.
• PALS — Patient Advice and Liaison Service. Every NHS Trust has one; first point of contact for non-formal questions and complaints.

Important: This guide is general information and not medical advice. Always consult your GP, NHS 111, or a qualified healthcare professional for clinical decisions about your own care.