Three steps give a usable reading from a wrist blood pressure monitor: cuff on bare skin 1–2 cm from the base of the palm, seated with back and elbow supported, and the wrist held still at heart level until the cuff deflates. The American Heart Association names two limits: heart level and a sensor kept over the artery.
Height error has a known direction and an estimated size: an Australian expert consensus put it at about 0.7 mmHg for every centimetre a cuff sits above or below the heart, a figure given for cuffs in general, so a wrist resting 10 cm too low would read roughly 7 mmHg too high. In a 2016 study of 721 people measuring at home, wrist readings ran 5.6% (systolic) and 5.4% (diastolic) higher than upper-arm readings, which the researchers traced mainly to wrist position after poorly remembered instructions.
How do I put on a wrist blood pressure cuff?
Put the cuff on bare skin with your palm and the monitor's display both facing up, leaving 1–2 cm (about half an inch) between the cuff and the base of your palm. Wrap it snugly so no gap remains between skin and cuff, and keep it off the bony bump on the outer side of the wrist. These are Omron's 7 Series steps; the American Heart Association adds that the sensor must sit directly over the radial artery.
Take off your watch, bracelet and any thick or tight sleeve; Omron's manual says not to apply the cuff over clothing. Wrist cuffs have a size range too: Omron's 7 Series cuff fits wrists of 13.5 to 21.5 cm (5.3 to 8.5 in) around, and Omron says to use it only within that range. Upper-arm cuffs are sized by arm circumference instead, as the cuff size guide explains.
Why does the wrist have to be at heart level?
A wrist reading is only accurate when the wrist is level with the heart, which the American Heart Association's 2019 scientific statement, describing where a cuff should sit, places at the midpoint of the breastbone. A wrist resting in the lap sits below the heart and reads too high; one raised towards the chin reads too low. An Australian expert consensus put the shift at about 0.7 mmHg per centimetre, for blood pressure cuffs in general.
Some monitors have a heart-zone indicator that shows when the wrist is at the right height. Treat it as an aid, not a guarantee: on Omron's 7 Series wrist monitor, for example, the cuff starts inflating 5 seconds after you press start even if the wrist is out of position, and Omron says the indicator may not help every body size and can be switched off.
How do I use a wrist blood pressure monitor, step by step?
Avoid food, caffeine, alcohol, smoking, exercise and bathing for 30 minutes, rest seated for 5 minutes, fit the cuff on bare skin, bring the wrist to heart level with the elbow resting on a table, and stay still and silent until the cuff deflates. This sequence follows Omron's 2021 manual for its 7 Series wrist monitor, which asks for 2–3 minutes between readings. Where your own monitor's manual differs, follow your manual.
- For 30 minutes before, avoid eating, caffeine, alcohol, smoking, exercise and bathing. Empty your bladder too, as the American Heart Association asks.
- Sit in a chair at a table, back supported, legs uncrossed, feet flat on the floor. Omron specifies about 30 cm (±5 cm) from seat top to table top for its heart-zone indicator.
- Rest quietly for at least 5 minutes.
- Fit the cuff: watch off, palm up, 1–2 cm from the base of the palm, snug, and clear of the wrist bone.
- Rest your elbow on the table and angle the forearm up until the cuff is level with the middle of your breastbone, with the arm supported rather than held up by effort.
- Relax the hand. Do not bend the wrist back or forward, and do not make a fist.
- Press start, check the position indicator if your monitor has one, then stay still and do not talk until the cuff has fully deflated.
- Read the display: systolic (top number), diastolic and pulse; note the time and which wrist. Omron's US 7 Series manual says its "high" symbol appears at 130 mmHg systolic or 80 mmHg diastolic or above. That is the maker's cut-off, not a diagnosis; other models differ, and your clinician decides what your readings mean.
- Take the next reading one to two minutes later, or after the longer wait your monitor's manual gives (Omron's 7 Series manual says 2–3 minutes). The home protocol sets out how many readings a sitting and how many days.
Which mistakes change a wrist reading, and by how much?
Holding the wrist above or below heart level is the mistake built into wrist devices, and an Australian expert consensus puts its size at about 0.7 mmHg per centimetre for cuffs in general. A bent wrist, or a cuff that has slipped out of position, makes a wrist reading unreliable in no fixed direction. General mistakes such as crossed legs, an unsupported back, talking or a full bladder raised readings by roughly 3–15 mmHg in upper-arm research, not wrist research.
| Mistake | What it does to the reading | Evidence and setting |
|---|---|---|
| Wrist above or below heart level | About 0.7 mmHg per cm: too low above, too high below | AHA 2019 (direction); Australian consensus 2015 (size, cuffs in general) |
| Wrist bent back or forward, or fist clenched | Unreliable, no set direction | Omron manual 2021; AHA 2019 |
| Cuff loose, or sensor slipped off the artery | Unreliable, no set direction | Omron manual 2021 (loose wrap); AHA 2019 (sensor must stay over the radial artery) |
| Cuff over a sleeve | Can change it by up to 50 mmHg, direction not stated | StatPearls 2026, upper-arm research |
| Back unsupported | Systolic up 5–15, diastolic up 6 mmHg | AHA 2019, upper-arm office research |
| Legs crossed | Systolic up 5–8, diastolic up 3–5 mmHg | AHA 2019, upper-arm office research |
| Talking | Both up about 10 mmHg | StatPearls 2026, upper-arm research |
| Full bladder | Both up 10–15 mmHg | StatPearls 2026, upper-arm research |
| Arm held up by your own effort | Higher, size not stated | AHA 2019, upper-arm office research |
Are wrist blood pressure monitors accurate?
Some wrist monitors can be accurate if used exactly as instructed and checked against clinic readings, Mayo Clinic says, but guidelines prefer upper-arm monitors. The American Heart Association's 2019 statement notes strong reservations about routine clinical use unless upper-arm measurement is not feasible, and the European Society of Hypertension's 2021 guidelines generally advise against them, citing lower accuracy and incorrect use. In a 2016 home study, 455 of 721 people had wrist errors of at least 10 mmHg.
The wrist device in that 2016 study had no position sensor. Even in clinic, with validated wrist and arm monitors from the same manufacturer, a 2026 study of 299 adults found the two sets of readings correlated, but the authors reported a systematic diastolic bias at the wrist and advised caution when reading wrist diastolic values. That is one study, with one reading per device, but it shows the two numbers are not interchangeable.
The European Society of Hypertension's 2021 guidelines say validated wrist devices might be used in people with very large arms when upper-arm measurement is not possible or reliable, and the AHA's 2019 statement says blood pressure may be measured at the wrist if an extra-large cuff does not fit. Mayo Clinic adds people who have had lymph nodes removed from the armpit. Children are a separate case: the AHA says wrist monitors cannot be recommended for them, and Omron's 7 Series manual says not to use that monitor on children at all. The same manual says it has not been validated in pregnancy and to consult a physician first. To find a validated wrist model, see how to check whether a monitor is validated.
Which wrist should I use?
Use the same wrist every time. Omron's 7 Series instructions show the left wrist by default but allow the right, and say that if the two wrists give substantially different readings, you should ask your physician which one to use. Switching sides from one reading to the next mixes two measurement sites into the same log, which makes any trend harder to read.
The method for comparing both arms was written for upper-arm cuffs, so agree the choice of wrist with your clinician.
What should my log say when I use a wrist monitor?
Every wrist reading should be marked as a wrist reading, with the side, because wrist and upper-arm numbers are not interchangeable. Keep the two in separate averages: in a 2016 home study, wrist readings ran 5.6% (systolic) and 5.4% (diastolic) higher than arm readings, and a 2026 clinic study found a systematic diastolic bias between validated wrist and arm monitors. A mixed average hides which device produced which number.
A note such as "L wrist" or "R wrist" beside each reading is enough, plus a note on the day you change devices; the printable blood pressure log has a notes column for it. In the Monitor2Log diary you can type a reading or photograph the display, check the numbers before anything is saved (a scan can misread a digit), and add the wrist in the row's notes. Mayo Clinic suggests bringing a wrist monitor to an appointment to check it against clinic readings; tell your clinician which device produced your log.
Sources
- American Heart Association, 2019, scientific statement on blood pressure measurement in humans (Muntner et al., Hypertension), including the limits of wrist devices.
- Omron Healthcare, 2021, instruction manual for the 7 Series wrist monitor BP6350: cuff placement, posture and the heart-zone indicator.
- Journal of Hypertension (Sharman et al.), 2015, Australian expert consensus statement on home blood pressure monitoring.
- Hypertension (Casiglia et al.), 2016, population study of wrist blood pressure self-measurement at home.
- European Society of Hypertension, 2021, practice guidelines for office and out-of-office blood pressure measurement (Stergiou et al., Journal of Hypertension 2021;39:1293–1302; full text may require a subscription).
- Mayo Clinic, 2024, expert answer on whether wrist blood pressure monitors are accurate.
General information only, not medical advice. Whether a wrist monitor suits you, and what your readings mean, are questions for your own clinician.