Arterial Line - transducer and zeroing

I'm getting confused about zeroing and transducer placement for arterial line. From my understanding, at least where I'm at, they zero using stopcock close to where the transducer is. Once it is zeroed, we don't need to re-zero but just move the transducer according to pt. Is this true? The following is the question from Hall's book. 20-gauge arterial line connected to a transducer that is located 20 cm below the level of the heart. The system is zeroed at the stopcock located at the... Arterial Line - transducer and zeroing
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