How to check if your blood pressure monitor is accurate

A plausible-looking number does not prove that a blood pressure monitor is accurate. Check the exact device, its cuff and the way you use it together.

Start with a validated device and suitable cuff

Look for an independently validated model appropriate to the person using it. Professional guidance generally favors an automatic upper-arm monitor for home measurements. A model suitable for one population is not automatically established for pregnancy or children.

Bring your monitor to a healthcare appointment so the team can check how you use it and compare it with their equipment. Ask when it should be checked again and follow the manufacturer's maintenance instructions.

Keep comparisons interpretable

An illustrative record includes the model, cuff, date and circumstances of a comparison. Two readings taken on different arms or at different times are not a complete accuracy test by themselves.

A common mistake is using a pharmacy kiosk or another home monitor as unquestionable proof that your own device is wrong. A surprising difference is a reason to investigate the setup, not to invent a correction factor.

Look up the exact model and intended population

Validation is more specific than a familiar brand name or a shop's description of a product as medical. Search an independent register such as STRIDE BP using the exact model identifier. Check whether the entry concerns home use and the relevant population. A validation study in general adults does not automatically establish performance in pregnancy, children or every clinical condition.

A missing listing is a reason to seek clarification, not proof of fraud. Ask the manufacturer which published validation supports the model. Keep the cuff range in the same check: a validated monitor still needs compatible equipment that fits the person using it.

Prepare a device check you can act on

1. Copy the model number from the device, including any suffix.

2. Search that exact model in an independent validation register and check the relevant population.

3. Record the cuff model and range; validation does not fix an unsuitable cuff.

4. Bring the monitor, cuff and instructions to an appointment.

5. Ask: “Can you check my technique and advise whether this device is appropriate for me?”

Keep the answer and any recommended recheck date with the equipment details. If a model is not listed, seek clarification instead of assuming either accuracy or inaccuracy.