Docfan Academy

A blood pressure monitor wraps a cuff around the upper arm, inflates it to squeeze the artery, then lets the air out slowly. An automatic monitor senses tiny pulses in the cuff as the pressure falls. A manual one relies on a stethoscope and the sounds you hear. Both give two numbers: the higher (systolic) and the lower (diastolic).

Set up the measurement

Most mistakes happen before the cuff goes on.

1. Let the person sit quietly, back supported, feet flat on the floor, legs uncrossed, for about 5 minutes.
2. Ask them to empty the bladder first, and to avoid coffee, smoking and exercise just before.
3. Place the cuff on a bare upper arm, not over thick clothing.
4. Rest the arm on a table so the cuff is at heart level.
5. No talking during the measurement.

Choose the right cuff

Cuff size matters more than most people think. A cuff that is too small gives readings that are too high. A cuff that is too large can give readings that are too low. Measure the arm, then match the cuff using the size marks printed on it. Keep small, standard and large cuffs available, and place the cuff as the IFU shows.

Use a validated device and keep it healthy

Choose models that were tested against an independent validation protocol. Upper-arm devices are generally preferred over wrist or finger devices. Check the tubes for cracks and leaks, change weak batteries, and compare the monitor against a reference device from time to time. Replace or recalibrate it as the maker advises, and straight away after a drop or when readings look odd.