Calling for an ambulance in a medical emergency could make the difference between life and death, but it’s not a call anyone would wish to make since it means you’re in a situation in which immediate assistance is needed.
Maybe there’s been an accident, or someone you care about has a medical emergency. You pick up the phone and dial 911. Then you hear the operator asking you, “What’s your emergency?”
Source: https://timebusinessnews.com/what-to-expect-when-you-call-an-ambulance