YSK that Operating Rooms handle their own “Code Blue” situations, which means they don’t announce “Code Blue” on the overhead speaker. If your loved one is in surgery and you hear “Code Blue” announced, don’t worry, it’s not for them.
from /r/YouShouldKnow
YSK，手术室会自己处理 "Code Blue "的情况，这意味着他们不会在头顶的扬声器上宣布 "Code Blue"。如果你的亲人在手术中，你听到 "Code Blue "的宣布，不要担心，这不是给他们的。