Published 2026-04-15 Last review 2026-05-20 Next review 2026-11-20
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What the numbers mean
A blood pressure reading has two numbers. The systolic (top) number measures pressure when the heart beats; the diastolic (bottom) number measures pressure between beats. Readings are given in millimetres of mercury (mmHg).
How readings are taken
Blood pressure is usually measured with a cuff around the upper arm while you are seated and rested. Because pressure varies during the day, clinicians rely on repeated measurements rather than a single reading.
What this article does not do
This article explains terminology only. It cannot tell you whether your own blood pressure is healthy. Interpretation depends on your age, conditions and local clinical guidance — discuss your readings with a qualified professional.
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Guidance can vary by country — check the jurisdictions above.
HealthPulse provides educational information and directory services — not medical diagnosis or emergency care.