How often should I measure my blood pressure at home, and what is normal?
Measuring at home gives a more reliable picture than a single reading at the doctor's office: measure at least seven days, twice a day, and use 135/85 mmHg as the upper limit of normal. Fluctuations and consistently elevated values are just as important as the average.
Home measurements give a more reliable picture of your blood pressure than a single reading at the doctor's office. In the consulting room, stress can skew the result, whereas at home you measure in a relaxed state in your own environment. Guidelines therefore consider home measurements to be superior to office measurements for assessing your true blood pressure.
The threshold values for home and office are not the same. In the consulting room, 140/90 mmHg is the upper limit of normal; at home, the equivalent is 135/85 mmHg. An ideal blood pressure is below 120/80 mmHg. For people with diabetes or chronic kidney disease, the treatment target is stricter: below 130/80 mmHg.
How often should you measure? Standardised recommendations generally state: measure on at least seven mornings and evenings (that is, twice a day), preferably over several weeks, and always take two readings per session with one minute in between. Use the average of those values, not a single isolated measurement. One high reading on its own says little; the pattern is what matters.
Not only the average matters, but also how much your blood pressure fluctuates. Greater fluctuations over time are associated with a higher risk of stroke or cardiovascular disease, independent of what the average value is. The magnitude of this increased risk is comparable to the effect of elevated cholesterol. Home measurements taken over multiple days give you precisely the insight into that variation.
Finally: if your blood pressure remains consistently elevated at home despite blood-pressure-lowering medication, that is a serious signal. In research, people with such treatment-resistant high blood pressure had an almost three times higher risk of stroke, heart attack or heart failure compared with people whose blood pressure was well controlled. Discuss this with your general practitioner or cardiologist, especially if you are taking three or more medications and are still recording values of 135/85 mmHg or higher at home.
All claims are based on observational and associative research or small randomised studies; there are no large RCTs on the optimal frequency of home measurement. The threshold values are based on guidelines and expert consensus.
What does my blood pressure say about my long-term health?
A structurally high or strongly fluctuating blood pressure substantially increases your risk of stroke, heart attack and premature death. Small adjustments such as eating less salt and measuring regularly make a demonstrable difference.
Heart palpitations or an irregular heartbeat -- when should I see a doctor?
Palpitations are usually harmless, but can also be the beginning of a serious cardiac arrhythmia. If you also experience dizziness, chest pain or a clearly irregular heartbeat, see your GP rather than waiting.
Can you see your biological age in your blood pressure?
Your blood pressure, and especially your nighttime blood pressure, says something about how your blood vessels are ageing, but it is not a complete measure of biological age. A 24-hour measurement provides more information than a single doctor's appointment, and with the DASH diet you can actively improve your values.
Does lowering my blood pressure really reduce my risk?
Lowering blood pressure genuinely works: your risk of stroke and other cardiovascular problems demonstrably decreases. Exercise and dark chocolate also provide a modest additional benefit.
How healthy are my blood vessels / what is my vascular age?
For a first impression of your vascular health, an ApoB blood test is the simplest and most accessible step; a CAC scan adds the most value when your risk remains unclear after blood testing.
Is high blood pressure at night more dangerous than during the day?
High blood pressure at night is more dangerous than a high daytime reading at the doctor's office. If your blood pressure does not drop enough at night, or even rises, your risk of a heart attack, stroke or heart failure is considerably higher, even if the reading at the practice looks perfectly fine.