Blood Pressure Guidelines in the UK: NHS and NICE Explained

UK practice follows the National Institute for Health and Care Excellence (NICE) — specifically guideline NG136, "Hypertension in adults: diagnosis and management", last updated in February 2026. The NHS follows NICE guidance, so the numbers your GP uses come from this document.

NICE defines hypertension as a clinic reading of 140/90 mmHg or higher together with a home (HBPM) or daytime ambulatory (ABPM) average of 135/85 or higher — a diagnosis is confirmed with both, not from one clinic reading. Within that, NICE grades severity in stages:

Two things stand out against other countries' charts. First, the double threshold: every stage is defined by a clinic number and a home number, because clinic readings run higher. Second, the boundary itself — the UK diagnoses hypertension from 140/90, while US guidelines use 130/80. The same 135/88 average is "stage 1 hypertension" in Boston and "not hypertension" in Birmingham.

When a clinic reading falls between 140/90 and 180/120, NICE says the diagnosis should be confirmed with 24-hour ambulatory monitoring, or home monitoring if ambulatory isn't suitable — which is why a GP who sees one high reading will usually send you home with a monitor rather than a diagnosis.

Because the diagnosis hangs on your home average, NICE specifies exactly how that average must be collected. The HBPM protocol:

• For each recording, take 2 consecutive measurements at least 1 minute apart, seated.
• Record twice daily, ideally morning and evening.
• Continue for at least 4 days, ideally 7.
• Discard the first day's readings and average all the rest.

If that sounds familiar, it's because this is exactly the 7-day protocol our measurement guide teaches — and the averaging the Blood Pressure Journal app computes for you. The NHS's own consumer advice mirrors it: take a reading, note the numbers, wait a minute, take it again, typically morning and evening. A structured blood pressure log keeps the whole week in one place.

The 135/85 home threshold is not a second opinion — it's the same line as 140/90 at the clinic. Readings taken at home run lower than readings taken in a surgery, so a home average at or above 135/85 corresponds to a clinic reading at or above 140/90. That correspondence is also why treatment is judged at home: for adults under 80, NICE's treatment target is a clinic reading below 140/90 or a home/ABPM average below 135/85; for adults aged 80 and over, the targets relax to below 150/90 at the clinic and below 145/85 at home.

The UK's device authority is the British and Irish Hypertension Society (BIHS), which maintains what it describes as the gold-standard list of validated blood pressure monitors — devices with published accuracy validations that followed a recognized BIHS, European or international protocol. NHS England's home-monitoring guidance tells patients buying a monitor to choose one listed as validated by the BIHS.

Three things worth knowing about the list. Validated devices are considered appropriate for both clinical and home use, so a home monitor from the list is measuring to the same standard your surgery does. The list covers conventional arm-cuff and wrist-cuff monitors only — there is no formal validation route for cuffless wearables yet. And it deliberately says nothing about price or features: a validated £25 monitor and a validated £120 one have passed the same accuracy bar. For how the device types compare — upper-arm, wrist, kiosk and the rest — see our guide to types of blood pressure monitors.

England has a national free-check scheme: the NHS Community Pharmacy Blood Pressure Check Service. You qualify if you are aged 40 or over, live in England, and haven't been diagnosed with high blood pressure (or had your blood pressure checked by a healthcare professional in the past 6 months). No appointment with your GP is needed — you go to a participating pharmacy, and the pharmacist takes the reading. Depending on the result they can give lifestyle advice, lend you a home monitor to collect the 7-day average above, or refer you to your GP — and the results go into your GP record either way. The scheme is England-only; elsewhere in the UK, ask your local pharmacy or GP surgery what's available.

Beyond the NHS service, the charity Blood Pressure UK runs Know Your Numbers! Week each September — the UK's biggest blood pressure testing and awareness event, with free checks at participating venues. And if you want to track on paper, the British Heart Foundation publishes a free printable blood pressure chart and diary — a colour reading chart plus a 25-week diary.

The Blood Pressure Journal app ships with the US ACC/AHA categories by default: normal below 120/80, elevated from 120/80, and hypertension from 130/80. That means a reading of 134/86 shows as high under the app's default bands while sitting below the UK's diagnosis line — not a contradiction, just two guideline bodies drawing the boundary in different places. Both are legitimate; your GP will work to NICE.

The app's classification ranges are customizable, so if you're being managed to UK thresholds you can set the high boundary to 140/90 (and the rest of the bands to match) and the colour coding will agree with your GP. Whichever bands you display, the number that matters in a UK consultation is your home average: if it sits at or above 135/85 over a proper 7-day run, that is the figure to discuss with your GP.

NICE draws the urgent line at a clinic reading of 180/120 or higher. On its own, without symptoms, that calls for prompt investigation and a repeat within 7 days — not a blue-light emergency. But 180/120 or higher with warning signs — chest pain, new confusion, signs of heart failure, or vision problems from retinal damage — means same-day specialist assessment.

The NHS's own advice for the public is symptom-led: call 999 if you get sudden chest pain or discomfort that does not go away, or chest pain with sweating, sickness, light-headedness or breathlessness — these could be a heart attack. For urgent concerns that aren't emergencies — frequent headaches, blurred vision, chest pain that comes and goes — ask for an urgent GP appointment or get help from NHS 111.

If a home reading comes back very high, don't panic on one number: sit quietly for a few minutes and measure again. A single spike can be stress, a rushed measurement, or a mis-wrapped cuff — but a repeat that stays at or above 180/120, or any of the symptoms above, is a reason to seek help now, not to keep logging.