('disapproving') She had a reputation for being an 'ambulance chaser'. [=a lawyer who gets clients by convincing accident victims that they should file a lawsuit about the accident]
She was taken 'by ambulance' [=in an ambulance] to the hospital.
They called (for) an 'ambulance'.
(..) see you at the base. Over and out. Roger, Mother Bird. Over and out. Look at this! Looks pretty bad. Take her pulse. Get an ambulance down here. I don't want to hold this convoy up more than I have to. She's having trouble breathing. What do you think? I suggest a vigorous chest massage. If that doesn't work, mouth-to-mouth. Yes, sir! I won't have my men do anything I wouldn't be prepared to do myself. Get an ambulance. Gather around. Turn around! Hi. Somebody hurt? I did it, Mr. Luthor. (..)1978 Superman