A method of obtaining a measurement of the blood pressure of a subject using a non-invasive blood pressure, NIBP, monitor, a pulse rate sensor, a cuff that is to be placed around a limb of the subject, a pump for inflating the cuff, and a pressure sensor for measuring the pressure in the cuff, wherein the pulse rate sensor is a different sensor to the pressure sensor, the method comprising:
- using the pulse rate sensor to obtain information on the pulse rate of the subject;
- adapting a pressure signal filter according to the obtained information on the pulse rate of the subject;
- starting inflation of the cuff using the pump;
- obtaining a pressure signal using the pressure sensor, the pressure signal representing the pressure in the cuff as the cuff is inflated;
- filtering the pressure signal using the adapted pressure signal filter during inflation of the cuff;
- and
- processing the filtered pressure signal to obtain a blood pressure measurement for the subject during inflation of the cuff.