Im only a Paramedic but is it not a reference to the Intensive care levels….
We use it as a guide for transferring patients between hospitals and or receiving hospitals for trauma.
LEVEL 0 Patients whose needs can be met through normal ward care in an acute hospital.
LEVEL1 Patients at risk of their condition deteriorating, or those recently relocated from higher levels of care, whose needs can be met on an acute ward with additional advice and support from the critical team.
LEVEL 2 Patients requiring detailed observation or intervention including support for a single failing organ system or post-operative care and those 'stepping down' from higher levels of care.
LEVEL 3 Patients requiring advanced respiratory support alone or basic respiratory support together with support of at least two organ systems. This level includes all complex patients requiring support for multi-organ failure.