Levels of care is a framework used in NHS critical care to classify the level of monitoring and organ support a hospitalised patient requires, guiding decisions about where they should be cared for and how many nursing staff they need. The system standardises communication about patient dependency between clinical teams and between hospitals.
The levels are: Level 0 (standard ward-based care with routine observations); Level 1 (ward-based care with additional monitoring such as continuous ECG, often provided in a monitored bay on a general ward); Level 2 (one invasive organ support therapy excluding advanced ventilation, traditionally provided in a high-dependency unit, HDU, and including continuous vasopressors, invasive arterial monitoring, or non-invasive ventilation); and Level 3 (ICU-level care, required for invasive mechanical ventilation alone or two or more simultaneous organ support therapies).
Following cardiac arrest, most survivors initially require Level 3 (ICU) care for mechanical ventilation, vasopressor support, targeted temperature management, and continuous haemodynamic monitoring. As the patient stabilises and individual support therapies are weaned, they step down progressively from Level 3 to Level 2 to Level 1 and eventually to a standard ward.
Each step-down reflects genuine clinical improvement and reduced dependency. Families should be aware that an early step-down from ICU does not mean the patient is fully recovered; it means specific levels of invasive support are no longer required. Staff will explain each step-down decision and what it means in terms of the patient’s progress and the monitoring that remains in place.
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