Other calls nationally are graded for different response times ranging from 20 minutes to an hour.

BBC: East of England Ambulance Service NHS Trust ambulance

The Glasgow Coma Scale is a standardized test that classifies a patient's motor, verbal and eye response on a graded scale.

CNN: Trapped 'coma' man: How was he misdiagnosed?

She added that training had been improved and every incident graded as "emergency" or "prompt response" was reviewed and closed by an inspector.

BBC: Northampton