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By Does Your Duck Quack

High blood pressure and home monitoring

Understand blood pressure readings, how to measure at home and what to discuss with your GP, including when a reading needs prompt advice.

Checked: 8 October 2026 · Next review: 8 April 2027 · Applies to: UK, with nation notes
How this guide was prepared

Purpose: how to guidance · Level: detailed

Checked by: Does Your Duck Quack. Sources are linked below; seek professional advice for individual circumstances.

The short answer

What to do first

Understand blood pressure readings, how to measure at home and what to discuss with your GP, including when a reading needs prompt advice.

Start here: Blood pressure is written as two numbers: the pressure when the heart beats and the pressure between beats. NICE uses a clinic reading of 140/90 mmHg or higher, confirmed by an average daytime ambulatory reading or home average of 135/85 mmHg or higher, when diagnosing hypertension. These are diagnostic thresholds, not personal treatment targets. NHS describes a reading below 90/60 mmHg as low blood pressure. NICE treatment targets can differ: for adults aged 80 and over, the clinic target is below 150/90 mmHg and the home average below 145/85 mmHg. These are not diagnostic thresholds or targets for everyone. Ask the clinician to interpret the result alongside your age, conditions and medicines rather than comparing it with someone else’s reading.

Visual guides

See the decision at a glance

Clinic and home thresholds
  1. Clinic readingNICE diagnostic threshold: 140/90 mmHg or higher, with confirmation.
  2. Home averageNICE diagnostic threshold: 135/85 mmHg or higher.
  3. Your targetAsk your clinician for an individual target, especially if you are 80 or older.
Take a useful home reading
  1. 1. Sit and settleSit with back supported, feet flat and arm resting at heart level.
  2. 2. Fit the cuffUse the right size upper-arm cuff and follow the device instructions.
  3. 3. Keep stillDo not talk during the reading; follow the schedule your clinician gave you.
  4. 4. Record resultsWrite down the date, time, readings and any symptoms.

Scope of this guide

This guide helps you understand the options and questions to ask. It is not personal medical, legal or financial advice. Check the official sources for your nation and seek qualified help for high-stakes decisions.

Who this guide is for

People asked to monitor blood pressure at home and relatives who want to support accurate readings without causing alarm.

High blood pressure often has no noticeable symptoms, so a measurement is more useful than guessing from how you feel. Home readings can help a clinician understand your usual blood pressure, but technique and context matter. A number on its own is not a diagnosis or a reason to alter prescribed treatment. Use this guide to prepare for a conversation with your GP, practice nurse or pharmacist.

Practical steps

1. Understand what a reading means

Blood pressure is written as two numbers: the pressure when the heart beats and the pressure between beats. NICE uses a clinic reading of 140/90 mmHg or higher, confirmed by an average daytime ambulatory reading or home average of 135/85 mmHg or higher, when diagnosing hypertension. These are diagnostic thresholds, not personal treatment targets. NHS describes a reading below 90/60 mmHg as low blood pressure. NICE treatment targets can differ: for adults aged 80 and over, the clinic target is below 150/90 mmHg and the home average below 145/85 mmHg. These are not diagnostic thresholds or targets for everyone. Ask the clinician to interpret the result alongside your age, conditions and medicines rather than comparing it with someone else’s reading.

2. Prepare a calm place to measure

Use an upper-arm monitor that has been validated for clinical use and a cuff suited to your arm. Sit quietly with your back supported, feet flat and arm resting at heart level; do not talk during the measurement. Follow the device instructions and the schedule given by your clinician. If you have just exercised, smoked, had caffeine or feel distressed, tell the clinician because this may affect how a reading is interpreted. Ask for help with the cuff if dexterity, pain or vision makes it difficult.

3. Take readings consistently and keep a record

Your clinician may ask for two readings at a sitting, a morning and evening routine, or a different plan. Follow the instructions given rather than inventing a schedule. Record the date, time, both numbers, pulse if displayed, symptoms and whether a dose was missed. Bring the monitor and log to an appointment if asked; a clinician can compare the device with a practice reading. A set of measurements is generally more useful than repeatedly checking whenever you feel worried.

4. Know what to do with an unusual result

If a reading is much higher or lower than usual, sit quietly and repeat it according to the advice you have been given. Contact your GP, NHS 111 or the local urgent-care service if you are concerned or feel unwell. Chest pain, severe breathlessness, stroke symptoms, collapse or a severe sudden headache need emergency assessment; call 999 for immediate danger. Do not delay emergency help to keep rechecking numbers. Ask your practice to tell you clearly what threshold should prompt a call for your own situation.

5. Ask how local checks work

In England, some pharmacies offer NHS blood-pressure checks, and a GP practice can advise whether that service suits you. Availability and eligibility for pharmacy or community checks differ across the UK and locally. Ask your GP practice, community pharmacy, health board or local NHS service which route is available in your nation. A community check does not replace follow-up if you have symptoms or have been asked to monitor at home.

6. Agree a plan rather than chasing a perfect number

If readings remain above the range your clinician expects, discuss next steps and the timing of review. NICE’s recommended targets can be different for people aged 80 and over, and individual circumstances can also change the aim. Ask what matters in your case and how to balance blood pressure with dizziness, falls, frailty or other conditions. Lifestyle changes such as activity, eating patterns, alcohol and smoking can be discussed without blame. Do not stop or change prescribed medicines; speak to your GP or pharmacist first.

Questions and checks

Common questions

What blood pressure is considered high?

NICE defines hypertension using a clinic reading of at least 140/90 mmHg together with a confirming daytime ambulatory average or home average of at least 135/85 mmHg. These are diagnostic thresholds, not a target that suits everyone. Your clinician should interpret readings with your age, health and medicines and explain what result should trigger follow-up for you.

How should I take my blood pressure at home?

Use an upper-arm monitor with the right cuff size, sit quietly with your back supported and feet flat, and rest your arm at heart level. Keep still and do not talk during the reading. Follow the schedule your clinician gives you and record the results. If you are unsure about fitting the cuff or reading the display, ask a practice nurse or pharmacist to demonstrate.

Should I worry about one high home reading?

A single result can be affected by activity, stress, pain or technique, so follow the advice from your clinician about repeating and recording it. Do not keep checking in a way that increases anxiety or change medicines yourself. If you feel unwell, the result is very different from usual, or you have been given a personalised action threshold, contact the service named in your plan.

Can I get a free blood pressure check at a pharmacy?

Some pharmacies provide NHS checks, including in England, but availability and eligibility vary across the UK and by locality. Ask your GP practice or community pharmacy what is available where you live. A pharmacy check is not a substitute for medical assessment if you have symptoms, a persistently raised reading or a clinician’s request for home monitoring.

Differences across the UK

NHS blood-pressure assessment and monitoring are available across England, Scotland, Wales and Northern Ireland, but pharmacy checks and referral routes vary by nation and locality. Ask your GP practice which services and urgent-care routes apply where you live. Clinical thresholds are guidance for assessment; your individual target should be agreed with your care team.

Primary sources

The publisher checked this guide against the 5 official sources below. This is an editorial source check, not approval by a clinician, lawyer or benefits adviser.

Editorial note: By Does Your Duck Quack.