What term is used to describe calls that are life-threatening?

The term used to describe calls that are life-threatening is "Emergency calls." This designation indicates situations that require immediate attention from emergency services because they pose a direct threat to life or severe injury. Emergency calls are often characterized by circumstances such as serious medical conditions, active fire incidents, or other urgent crises where timely intervention could save lives or mitigate critical damage.

In contrast, nonemergency calls typically relate to situations that do not pose an immediate danger to life, while critical calls can vary in urgency but might not necessarily imply a life-threatening situation. Urgent response calls could indicate time-sensitive scenarios but do not specifically align with the definition of life-threatening emergencies. Thus, emergency calls are the precise term for situations where immediate action is crucial due to the potential risk to human life.