How to take blood pressure at home

The method, step by step

1. No coffee, cigarettes or exercise for thirty minutes beforehand. Empty your bladder first — a full bladder raises readings.
2. Sit quietly for five full minutes before measuring. This is the step most often skipped and it matters.
3. Sit with your back supported against the chair, feet flat on the floor, legs uncrossed.
4. Rest the arm on a table so the middle of the cuff is level with the heart. An arm hanging down reads high.
5. Put the cuff on bare skin, about an inch above the elbow crease, snug enough to slide one finger underneath.
6. Press start and stay still. Do not talk during the measurement — talking raises the reading measurably.
7. Wait one minute and take a second reading. Record both, with the date and time.
8. Measure at the same times each day, usually morning before medication and evening, unless the doctor says otherwise.

The five things that make readings wrong

• A cuff that is too small, which reads systematically high. Measure the arm and match the cuff range.
• The arm below heart level, which also reads high. Rest it on a table, not on a lap.
• Talking during the measurement.
• Not sitting quietly first. Five minutes of stillness is part of the measurement, not a preliminary.
• A cuff over a sleeve. Bare skin only — a rolled-up sleeve bunching above the cuff is its own problem.

Keeping a record the doctor can use

Write down every reading, not only the alarming ones or the reassuring ones. A two weeks of readings at consistent times tells a doctor far more than a single measurement in a clinic, and selective recording makes the whole exercise useless.

Note anything unusual alongside: a bad night, a new medication, a cold. Context explains outliers that would otherwise prompt an unnecessary change.

Take the record to the appointment, along with the monitor itself if possible — the practice can check it against their own device, which is worth doing once when it is new.

Do not change or stop any medication on the basis of home readings. Single high readings are common and usually mean little; what matters is the pattern, and interpreting it is the doctor's job.

When to seek help urgently

Ask your doctor what numbers should prompt a call, because the threshold depends on the person. As a general rule, a very high reading accompanied by chest pain, breathlessness, severe headache, vision changes, weakness on one side or difficulty speaking is an emergency — call 911 rather than rechecking.

A single high reading with no symptoms is usually not an emergency. Rest for five minutes, measure again, and if it remains high, contact the doctor's office for advice.