Who to contact about high blood pressure: GP, NHS 111 or 999
Your GP surgery is the usual starting point for repeated high readings. NHS 111 can advise when the need is urgent, while 999 is for a life-threatening emergency.
Updated 3 min read
For repeated high readings without emergency symptoms, contact your GP surgery. A GP or another member of the practice team can arrange the checks used to confirm high blood pressure and decide whether specialist advice is needed. Use NHS 111 when you need urgent advice and are not sure where to go. Call 999 for a life-threatening emergency.
The reading matters, but symptoms and context decide the route. An app cannot make that decision for you.
When to call 999
The NHS 999 guide says 999 is for life-threatening emergencies. Examples include chest pain that does not go away, severe difficulty breathing and signs of a stroke, such as sudden face or arm weakness or difficulty speaking.
Do not wait for another blood pressure reading if someone has these symptoms. Put the monitor aside and call 999.
NICE NG136 also gives clinicians a specific same-day pathway for a clinic reading of 180/120 mmHg or higher with retinal bleeding or swelling, or life-threatening symptoms such as new confusion, chest pain, signs of heart failure or acute kidney injury. Those findings need clinical assessment. A home monitor cannot check for all of them.
When to contact your GP surgery
Contact the surgery about repeated high home readings, even if you feel well. The NHS notes that high blood pressure often has no symptoms, which is why repeated measurements matter.
If a very high reading remains after you have rested, checked the cuff and repeated it carefully, seek same-day advice from the surgery. If it is closed or you are unsure what to do, NHS 111 can direct you to an appropriate service. Availability and response times vary, so this is not a promise of a particular appointment.
How high blood pressure is confirmed
NICE says that a clinic reading of 140/90 or higher should usually be checked with ambulatory monitoring over 24 hours or a series of home readings. Hypertension is confirmed when the clinic result is paired with a daytime or home average of 135/85 mmHg or higher.
For home monitoring, NICE recommends two seated readings at least one minute apart, twice a day, ideally morning and evening, for at least four days and ideally seven. Leave out the first day and average the remaining readings. The British and Irish Hypertension Society provides a seven-day diary built around the same morning-and-evening routine.
A GP may request a different schedule for your circumstances. Follow the instructions you have been given rather than assuming every practice uses the same form or file format.
Where you can have a blood pressure check
You can ask your GP surgery or a local pharmacy about checks. In England, the NHS pharmacy blood pressure service offers free checks to eligible people aged 40 or over who do not already have diagnosed high blood pressure. There are exceptions for some people at increased risk.
That service is specific to England. Eligibility and arrangements elsewhere in the UK differ, so check locally rather than assuming that every pharmacy offers the same service or that it is free.
For home monitoring, choose an upper-arm cuff monitor validated for clinical accuracy and make sure the cuff fits. The British and Irish Hypertension Society publishes a UK validation list. Price, stock and borrowing schemes vary.
What to take to an appointment
Bring a clear record of the readings requested by the practice. Include dates, times, both blood pressure numbers, pulse and notes about anything unusual. The printable blood pressure diary gives you a paper sheet, and the average blood pressure calculator can summarise a home series. How to keep a blood pressure diary explains what belongs in each row.
Ask before bringing the monitor itself. Some practices may want to review your technique or equipment, but this is not available at every appointment. Also ask how the surgery prefers to receive a digital report.
BP Diary lets you choose a date range and print or share readings, averages, charts, pulse and notes. It supports the conversation but does not diagnose high blood pressure or replace professional advice.