Will anesthesia show up on a drug test?

Yeah, but don't sweat it much: if you tell the tester you had an operation, and you DID have an operation, they'll know you needed general anesthesia so any general anesthetic that shows up will be okay. General anesthetic is one of those classes of drugs I don't understand wanting to abuse--how much fun is a drug that just makes you fall asleep? If you're gonna do drugs, wouldn't you want to be awake for it?