New to high blood pressure: what to measure, write down and ask in the first weeks
High blood pressure newly diagnosed: how to measure at home, what to write down and which questions to bring to your next appointment.
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After a high blood pressure diagnosis you can take three things into your own hands: measure at home the right way, write down every reading and collect questions for your next appointment. Everything else, such as medicine and lifestyle, you settle with your doctor. You can keep your readings in Sam, next to the sleep and activity that Sam picks up from Apple Health.
This text is for you if a doctor has already diagnosed high blood pressure. If your first hint came from a smartwatch notification, this post still starts where a doctor has confirmed the diagnosis.
What does the diagnosis mean?
With high blood pressure, the pressure in your blood vessels stays too high over time. The NHS says it usually causes no symptoms, so it is found by measuring, not by feeling unwell. Over time it can raise the risk of problems such as heart attack and stroke.
The NHS calls readings high at 140/90 or higher in a clinic and 135/85 or higher at home. The 2024 European Society of Cardiology guidelines use the same cut-offs. The CDC defines high blood pressure in the US from 130/80. Thresholds differ between guidelines and countries, so ask your doctor which one applies to you.
These numbers are for diagnosis. A target is something else. Your doctor agrees a target with you, and the same goes for medicine.
How do I measure at home?
Home readings show your doctor how your pressure looks in daily life. Blood Pressure UK and the 2024 European guidelines agree on the basics:
- Use a validated upper-arm monitor. The British Heart Foundation points to the British and Irish Hypertension Society list.
- Do not measure within 30 minutes of eating, smoking, caffeine or exercise. Wear loose clothing.
- Rest for five minutes, sitting with your back supported and feet flat on the floor.
- Rest your arm on a table at heart level. Keep still and do not talk while it measures.
- Place the cuff about 2 cm above the elbow, says Blood Pressure UK. The British Heart Foundation adds that there should be just enough room to slide two fingers underneath.
- Take two or three readings one to two minutes apart, morning and evening, for seven days.
Write each reading down at once: date, time, top and bottom number, pulse. Include readings you do not like. Add anything unusual, such as poor sleep, an infection, pain or stress. If you take medicine, note that too.
In Sam you log each reading with pulse, arm and whether you measured at home or at the practice. If your monitor has saved the reading to Apple Health, Sam can take it from there.
Blood Pressure UK says to ignore the first day when you work out an average, because those readings tend to be higher while you get used to the monitor. How often you measure beyond the first week depends on your situation. Ask your doctor for your rhythm. The blood pressure category calculator shows the 2018 European categories for clinic readings. It is not meant for single home readings. Our post on living with high blood pressure and daily readings shows how daily numbers add to the conversation.
What does my doctor check next?
The order is up to your doctor, and some of it may already have happened. The NHS describes how high blood pressure is confirmed. If a clinic reading is high, you may be asked to check at home for a few days or to wear a portable monitor for 24 hours. Your doctor may repeat checks a few days or weeks later before confirming the diagnosis.
After that you agree how to go on, which target to aim for and when to come back. Bring your readings to each follow-up.
The NHS lists lifestyle changes for everyone with high blood pressure: a balanced diet with less salt, at least 150 minutes of exercise a week, a healthy weight, limited alcohol and no smoking. Doctors may add medicine, sometimes more than one.
Which questions do I bring to my next appointment?
Write the questions down beforehand, because in the room they are quickly forgotten. These work as a start:
- Which readings led to the diagnosis, and which home readings count for me?
- How long and how often do I measure at home? When do I show you the numbers?
- Which monitor suits me, and what cuff size?
- Which checks come next?
- Do I need medicine, and what speaks for or against it?
- Which target are we aiming for?
- At which readings or symptoms should I contact you between visits?
- When is my next review?
Write down the answers during the visit and ask about anything unclear. Our checklist for a doctor visit with a chronic condition has a general list.
What do I bring?
- Your record with all readings, on paper, in a log or as a PDF report from Sam.
- Test results and letters, such as lab results and an ECG, as copies or photos.
- A list of everything you take regularly, including pharmacy products.
- Whether high blood pressure runs in your family.
- Your questions.
What can an Apple Watch do here, and what can it not?
An Apple Watch does not measure blood pressure and does not show you blood pressure values. Those come from your cuff.
Apple's hypertension notifications are made for adults aged 22 and over without a high blood pressure diagnosis. With a diagnosis you are not the target group. Apple states that the feature is not intended to diagnose, treat or aid in the management of hypertension. See can a smartwatch measure blood pressure? for the reasons.
What the watch can give you is daily data such as resting heart rate, sleep and activity. That is context for the conversation, not a blood pressure value. In Sam it sits next to your entered readings. To set it up, see Apple Watch setup for high blood pressure.
The Health app also has a blood pressure log. You need an iPhone 11 or later and a cuff. You choose one of two purposes: 7 mornings and 7 evenings, or one reading daily for 28 days. At the end you tap Export PDF to share it with your doctor. Our guide to connecting a blood pressure monitor to Apple Health shows the steps.
When should I not wait for the appointment?
The British Heart Foundation lists a top number over 180 or a bottom number over 120 as severe hypertension and says to seek urgent medical help if a reading is dangerously high. NICE, which sets guidance for the NHS in England, calls a clinic reading of 180/120 or higher severe hypertension and advises same-day specialist assessment if it comes with life-threatening symptoms such as new confusion or chest pain. Cleveland Clinic describes a hypertensive crisis as a top number of 180 or higher and/or a bottom number of 120 or higher. With chest pain, vision changes, slurred speech, dizziness or severe headache, Cleveland Clinic calls that an emergency. Call your local emergency number (112 in the EU, 999 in the UK, 911 in the US) or have someone call. The NHS says to call the emergency number for sudden, severe chest pain with other symptoms such as sweating or breathlessness.
Cleveland Clinic advises that without symptoms you rest for several minutes and measure again, and get medical care if it does not come down. If you are pregnant, ask your doctor or maternity team about raised readings right away. This text does not replace a medical assessment.
Log blood pressure in Sam and take it to your appointment
You arrive at your check-up with a PDF report where readings, daily life and medicine intake already sit together, from the high blood pressure program.
- Instead of a paper log: you log each reading with date, arm and pulse, or Sam takes readings your monitor saved to Apple Health.
- Instead of Apple Health alone: sleep, resting heart rate, steps and weight sit next to your readings in the report, plus the alcohol days you enter.
- Instead of memory: you tick off your medicine at your set time, and intake appears in the report.
The program is for people whose doctor has diagnosed high blood pressure. Sam does not measure blood pressure.
Try Sam HealthSam is a wellness companion, not a medical device. The app does not diagnose, treat, cure or prevent any condition or health state. Always consult qualified professionals for medical decisions.
Sources
Updated: October 2026
- NHS: High blood pressure (hypertension), Diagnosis (last reviewed 19 July 2024) and Blood pressure test (reviewed 25 November 2025)
- CDC: About high blood pressure (last updated 28 January 2026)
- ESC: 2024 ESC Guidelines for the management of elevated blood pressure and hypertension. Eur Heart J 2024;45(38):3912-4018
- Blood Pressure UK: How to measure your blood pressure at home
- British Heart Foundation: Choosing and using a blood pressure monitor and High blood pressure (updated 31 March 2026)
- British and Irish Hypertension Society: Validated BP monitors
- NICE: Hypertension in adults: diagnosis and management (NG136)
- Cleveland Clinic: Hypertensive crisis (last updated 1 April 2026)
- Apple Support: Log your blood pressure in the Health app and Hypertension notifications on Apple Watch (published 14 September 2026)
More on High Blood Pressure
Frequently Asked Questions
What blood pressure reading counts as high?+
The NHS calls blood pressure high at 140/90 or higher when a health professional checks it, and 135/85 or higher at home. The 2024 European guidelines use the same cut-offs. US guidance, such as the CDC, defines high blood pressure from 130/80. Thresholds differ between guidelines, and they are for diagnosis, not your target. Your doctor agrees your target with you.
Do I have to start tablets right away?+
That is for your doctor to decide, not an article or an app. The NHS says doctors typically prescribe medicine if your pressure is very high, if your risk of heart disease is raised, or if lifestyle changes were not enough. Ask at your next appointment what speaks for or against medicine. If you already have tablets, take them as prescribed and do not stop on your own.
How often should I measure at home?+
The 2024 European guidelines suggest 7 days in a row, morning and evening, with duplicate readings. Blood Pressure UK describes the same pattern, with two or three readings each time, and says to ignore the first day when you work out an average. Your own rhythm is agreed with your doctor.
Morning or evening?+
Both. Measure morning and evening at about the same times, and take two readings each time, one to two minutes apart. Rest for five minutes first. That gives your doctor two times of day and an average over the whole week.
What can I record with my Apple Watch if I have high blood pressure?+
Resting heart rate, sleep and activity, for example. An Apple Watch does not measure blood pressure. Those numbers come from your own upper-arm monitor. You can enter them by hand in Apple Health, or use the blood pressure log in the Health app and export a PDF.
What do I bring to my next appointment?+
Your record with date, time and all readings, test results and letters, a list of everything you take regularly, and your questions. Say whether high blood pressure runs in your family. Copies or photos are enough.
When is a reading an emergency?+
The British Heart Foundation lists a top number over 180 or a bottom number over 120 as severe hypertension and says to seek urgent medical help if a reading is dangerously high. Cleveland Clinic describes a hypertensive crisis as a top number of 180 or higher and/or a bottom number of 120 or higher. With chest pain, vision changes, slurred speech or severe headache, call your local emergency number: 112 in the EU, 999 in the UK, 911 in the US. Without symptoms, Cleveland Clinic advises to rest for several minutes and measure again, and to get medical care if it does not come down.