In our 30 bed combined Trauma/Neuro/Surgical/Cardiovascular/Cardiac ICU, we are having a bit of a dilemma as to where to level the transducer on our ICP drainage set. We use the Codman system. I was taught by my preceptor that it's levelled to the tip of the ear. I've read in several different areas that it should be levelled to the tragus of the ear and another reference said it should be levelled to the outer canthus of the eye. Which is correct? I know that it DOESN'T get leveled to the phlebostatic axis where we level the transducers for our Swans and Art lines yet some RN's in our unit have done that and then called the MD when the readings were off! Thanks for your help!