Blood Pressure at Home: How to Measure It Right, and What the Numbers Mean
Heart & Labs · Self-monitoring
Home readings are often more accurate than the ones in my office. But only if you take them the right way, and almost nobody has been shown how.
Written for my patients. If you are not one, read "call me" as "call your own clinician", and take the questions here to them.
High blood pressure is the most common and most fixable cause of heart attack, stroke, kidney disease and dementia, and it produces no symptoms until it has done damage. That combination is why I take it seriously in people who feel perfectly well.
The problem with checking it in a clinic is the clinic. Nerves, rushing in from the parking lot, a cuff over a sleeve, a conversation during the reading. Office numbers run high in some people and miss high pressure that only shows up at home in others. The 2025 national guideline now strongly recommends home monitoring for both diagnosis and treatment, and I agree with it.
What the numbers mean
| Category | Top number / bottom number |
|---|---|
| Normal | Under 120 and under 80 |
| Elevated | 120 to 129, and under 80 |
| Stage 1 high | 130 to 139, or 80 to 89 |
| Stage 2 high | 140 or higher, or 90 or higher |
| Severe | Above 180 or above 120. See the last section. |
The goal for most adults is under 130/80. If only one of your two numbers is high, the higher category is the one that counts.
Choosing a monitor
- An upper-arm cuff. Not a wrist device, not a finger device.
- Validated for accuracy. Check the list at validatebp.org before you buy. Many monitors on the shelf have never been tested.
- The right cuff size. A cuff that is too small reads falsely high, and this is the most common error I see in people with larger arms. Measure around the middle of your upper arm and match it to the cuff's printed range.
- Skip smartwatches and cuffless devices for now. The 2025 guideline says they are not reliable enough yet.
- Bring it to a visit once so we can check it against the office machine.
How to take an accurate reading
When and how often
To find out whether you have high blood pressure, or whether a new medicine is working: two readings every morning before medicine and breakfast, and two every evening, for seven days in a row. Write them all down or use the monitor's memory. It is the average that counts, not any single reading. One high number after a hard day means very little. Once you are stable, a few days a month is enough.
What lowers it
Get help right away
I wrote this for my patients, and it reads the same for everyone: general information, not a plan. If you would like your own numbers read against your own story, that is what a Lab Second Look is for. If you are not sure where to start, the free intro call is fifteen minutes.
A note on how to use this. General information for my patients, not individualized advice.
- Jones DW et al. 2025 AHA/ACC/multisociety guideline for the prevention, detection, evaluation, and management of high blood pressure in adults. Hypertension and Circulation, published August 14, 2025.
- Shimbo D et al. Self-measured blood pressure monitoring at home: a joint policy statement from the American Heart Association and American Medical Association. Circulation 2020;142(4):e42–63.
Trang Ca Laube, FNP-BC, FMACP · Reclaim Power Telehealth · Updated September 2026
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