Patient guide · Cardiovascular
24-hour ambulatory blood pressure monitoring, the NICE-recommended way to confirm a diagnosis of hypertension.
A small monitor worn for 24 hours takes automatic blood pressure readings every 20–30 minutes during the day and every hour at night. NICE-recommended to confirm or exclude hypertension and to reveal white-coat, masked and nocturnal patterns.
Why ABPM, not a clinic reading
- 01
NICE first-line
ABPM is the NICE-recommended way to confirm or exclude a diagnosis of hypertension — not a single clinic reading.
- 02
Reads the whole day
Automatic readings every 20–30 minutes by day and hourly overnight reveal white-coat, masked and nocturnal patterns.
- 03
Report within 48 hours
A written report with daytime, night-time and dipping analysis is issued within 48 hours of device return.
Key facts
The six things worth knowing about ABPM.
The essentials — what the test is, when it is used, what the numbers mean and why it beats a clinic reading.
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What it is
24-hour blood pressure monitor with automatic readings across day and night.
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NICE first-line
The NICE-recommended test to confirm hypertension when clinic BP is ≥ 140/90 mmHg.
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Reveals hidden patterns
White-coat, masked and nocturnal hypertension are only visible on ABPM.
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Diagnostic threshold
A daytime average > 135/85 mmHg is diagnostic of hypertension.
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Nocturnal dipping
The overnight dipping pattern is independently prognostic of cardiovascular risk.
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Best CV predictor
ABPM predicts cardiovascular outcomes more accurately than clinic BP.
Preparation
From fitting to report — what happens, in order.
A simple sequence: fit the cuff, live your normal day, return the device, receive the report within 48 hours.
Phase 1 · Before
Simple, at-home preparation
Phase 2 · The 24 hours
Device on, life as usual
Phase 3 · After
Return, download, report
- 01
Before
Wear a loose-sleeved top
A loose-fitting sleeve makes cuff fitting comfortable and lets the device inflate cleanly.
- 02
The 24 hours
Cuff fitted on the non-dominant arm
A nurse fits the cuff on your non-dominant arm and pairs it with the recorder on a belt or shoulder strap.
- 03
The 24 hours
Wear the device for 24 hours
The monitor stays on day and night — daytime readings every 20–30 minutes, hourly through the night.
- 04
The 24 hours
Keep to your normal activities
Work, walk and sleep as usual. Keep your arm still and relaxed during each reading.
- 05
The 24 hours
Keep a short diary
Note wake and sleep times, medications, exercise and any symptoms — it sharpens interpretation.
- 06
After
Return the device the next day
Bring the monitor back after 24 hours so the data can be downloaded and analysed.
- 07
After
Report issued within 48 hours
A written report with daytime and night-time averages, dipping and interpretation follows within 48 hours.
Typical end-to-end: 3 days. Report: within 48 hours of device return.
What it shows
The numbers a clinic reading can’t give you.
Daytime and night-time averages, dipping, morning surge and the patterns that only a full 24-hour recording can reveal.
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Daytime average
Mean systolic and diastolic BP during waking hours — the primary diagnostic number.
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Night-time average
Mean overnight BP — often the earliest signal of true, sustained hypertension.
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Dipping pattern
Whether BP falls overnight as it should — non-dipping raises cardiovascular risk.
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White-coat hypertension
High in clinic, normal at home — ABPM confirms it and can avoid unnecessary treatment.
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Masked hypertension
Normal in clinic, high on ABPM — a pattern that carries the same risk as sustained hypertension.
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Morning surge
The rapid rise in BP on waking — a large surge is associated with stroke risk.
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Circadian variability
Beat-to-beat and diurnal variability, useful in autonomic and treatment-resistant cases.
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Red flag: readings consistently > 180/110 mmHg — same-day medical assessment
Do not wait for the full report. Contact your GP or urgent care the same day.
Next steps
What follows the ABPM result.
From reassurance and lifestyle advice to NICE-guided drug therapy, cardiology referral and a repeat ABPM to confirm control.
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Reassurance if normal
If daytime average is ≤ 135/85 mmHg with normal dipping, no antihypertensive therapy is needed.
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Lifestyle advice
Weight, salt, alcohol, exercise and sleep — the first-line intervention for stage 1 hypertension.
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Antihypertensive therapy per NICE NG136
Age- and ethnicity-guided drug choice: ACEi/ARB, CCB or thiazide-like diuretic, stepped as needed.
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Home BP monitoring for follow-up
A validated home monitor for morning and evening readings, used to titrate treatment between reviews.
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Cardiology referral for resistant hypertension
When BP stays above target on three drugs including a diuretic, a specialist opinion is indicated.
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Investigate secondary causes
Renal artery disease, phaeochromocytoma, Conn’s and thyroid disease — worked up when features suggest.
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Cardiovascular risk assessment
QRISK3, lipids and glucose to place the BP finding in a full 10-year cardiovascular context.
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Follow-up ABPM at 6–12 months
Repeat ABPM after treatment change or lifestyle intervention to confirm control across the whole day.
Red flags
When to seek same-day medical assessment.
ABPM is safe. These features change the pace — same-day medical assessment, not a routine appointment.
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Sustained BP > 180/110 mmHg
Requires same-day medical assessment regardless of symptoms.
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Papilloedema
Fundoscopic finding of accelerated hypertension — urgent same-day referral.
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Chest pain
Consider hypertensive emergency, acute coronary syndrome or aortic pathology.
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Neurological symptoms
New weakness, visual loss, slurred speech or confusion — call 999.
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Renal impairment with hypertension
Rising creatinine or new proteinuria warrants urgent renal and cardiology review.
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Pregnancy hypertension
BP ≥ 140/90 mmHg in pregnancy needs same-day maternity assessment.
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Suspected phaeochromocytoma
Paroxysmal hypertension with headache, palpitations and sweating — refer for biochemical work-up.
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Aortic dissection symptoms
Tearing chest or back pain with hypertension — 999, not a private slot.
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Secondary hypertension features
Early onset, resistant BP, hypokalaemia or renal bruit — investigate for an underlying cause.
Reading your report
An ABPM report can look busy. It isn’t.
Whatever the finding, the report keeps to the same four parts.
A quiet reminder
The report is written for your doctor, not for you — and that’s normal.
If you would like us to talk you through it before your follow-up, just ask.
- 01 Header
Indication and clinic BP
Your details, the reason for the test, current medications and the clinic BP that prompted ABPM.
- 02 Technique
Device, cuff size and read success rate
The validated device used, cuff size, number of valid readings and the day/night split.
- 03 Findings
Daytime, night-time averages and dipping
Daytime and night-time systolic and diastolic averages, dipping percentage and morning surge.
- 04 Impression
The conclusion: read this first
Hypertension confirmed or excluded, pattern (white-coat, masked, sustained, nocturnal) and the concrete next step.
Sources
Guidelines that shape this page.
- NICE. Hypertension in adults: diagnosis and management (NG136).
- British and Irish Hypertension Society. ABPM guidance and validated devices.
- European Society of Hypertension. Practice guidelines for ambulatory blood pressure monitoring.
- American Heart Association. Scientific statement on ambulatory blood pressure monitoring.
Reviewed by Pulse Atlas Editorial Board, . Last reviewed 2026-07-30. Next review 2027-07-30. Reading time ~6 minutes.
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Frequently asked
Everything we get asked about ABPM.
Quick answers on why NICE recommends it, what counts as diagnostic, sleeping with the cuff and how quickly the report arrives.
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How does 24-hour blood pressure monitoring actually work — and do I have to wear it to work?
You wear a small arm cuff and belt-clip monitor for 24 hours; it inflates automatically every 20–30 minutes during the day and hourly at night, and you carry on with a normal working day, commute and sleep. It’s the NICE-recommended way to confirm hypertension and rule out white-coat effect, and in London we can fit and interpret one privately within a week.
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Why does NICE recommend ABPM to diagnose hypertension?
NICE NG136 recommends ABPM as the first-line test to confirm hypertension because clinic readings can be raised by anxiety (white-coat effect) or falsely normal (masked hypertension). ABPM reduces both errors and predicts cardiovascular outcomes better than clinic BP.
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What counts as a diagnostic result?
A daytime ABPM average above 135/85 mmHg confirms stage 1 hypertension. Above 150/95 mmHg is stage 2. The night-time average and dipping pattern add prognostic detail.
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Will I feel the cuff inflating overnight?
You will feel each reading as the cuff inflates — that is normal. Most people sleep reasonably well. The overnight readings are the most useful part of the test, so keeping the device on through the night matters.
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Can I shower or exercise with the monitor on?
No showering with the device fitted — it must stay dry. Light activity is fine; avoid vigorous exercise so the readings reflect your usual day. Keep your arm still and relaxed while the cuff inflates.
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How quickly will I get results?
The device is returned the next day, downloaded and analysed. A written report with daytime and night-time averages, dipping and interpretation is issued within 48 hours.
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In practice, in London
Where ambulatory blood pressure monitoring sits in a private London pathway
With ambulatory blood pressure monitoring, the London question is usually about report turnaround and the radiologist reading it — not whether the scan is available. Public provision for ambulatory blood pressure monitoring is competent but constrained by capacity. Private London clinics tend to have shorter diaries and longer appointment slots, so you get the same specialists with more time. For people who’ve been going round in circles with primary care, that first proper conversation is often what shifts things.
The mechanics are straightforward: a consultant appointment, any tests done at a nearby CQC-registered site, and a written report back within a few days. London’s density of private diagnostics — Marylebone, the City, Chelsea, Canary Wharf — means most patients can find something that fits around work without a cross-town trek. For ambulatory blood pressure monitoring specifically, the difference between a routine report and a sub-speciality read is where private care earns its keep.
The value of going through a concierge for ambulatory blood pressure monitoring isn’t access — anyone with an insurer or a credit card can get a private appointment in London. The value is knowing which consultant reads this particular presentation best, which unit turns reports around fastest, and which pathway won’t hit a dead end if the findings point somewhere unexpected.