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，手術室會自己處理 "Code Blue "的情況，這意味着他們不會在頭頂的揚聲器上宣佈 "Code Blue"。如果你的親人在手術中，你聽到 "Code Blue "的宣佈，不要擔心，這不是給他們的。