IEC 60601-2-34

The particular standard for invasive pressure monitoring equipment. It covers the accuracy of the pressure channel, zeroing, the transducer's defibrillation protection and alarms. In practice the error a patient sees is mostly the setup: the transducer level against the phlebostatic axis (about 0.74 mmHg for every centimetre of height difference), an unflushed line with bubbles damping the trace, and the square-wave test that shows whether the system is over- or under-damped.

A summary written by BMEssentia for learning, not the text of the standard. Always work from the current official edition and the manufacturer's instructions.