Blood pressure (systolic)
What this test measures
Systolic blood pressure is the higher of the two blood pressure numbers, the pressure in the arteries when the heart beats.
Why doctors request it
Measured at almost every clinical contact, and at home by many people.
What commonly pushes it up
- Stress, pain, caffeine, a full bladder, talking during the reading
- Being in a clinic (white coat effect)
- Being overweight, high salt intake, alcohol
- Increasing age
- Some medicines as a class
What commonly pushes it down
- Blood pressure medicines as a class
- Dehydration, blood loss or severe illness
- Standing up quickly
Everyday reasons for a value outside the range
- The first reading of a session is often highest
- Home readings run about 5 mmHg lower than clinic ones, and the thresholds differ accordingly
- A cuff that is too small reads high
About the sample
Seated, rested for five minutes, arm supported, no talking. The average of several readings matters, not one.
Upload a photo or PDF and see every line against the range your lab printed, explained in plain English. First report free.
Read my report freeThis is an educational summary of results you uploaded. It is not medical advice, a diagnosis or a treatment plan, and it does not replace the doctor who requested the test. If you are worried, or a result is marked outside range, discuss it with your doctor. Written and reviewed by a UK consultant physician. Reference ranges vary between laboratories.