Used as a descriptor for the dependency of a hospitalised patient. Level 0 refers to standard ward-based care. Level 1 refers to ward-based care plus additional support e.g. continuous ECG monitoring. Level 2 refers to one invasive organ support therapy excluding invasive ventilation (traditionally called HDU). Level 3 refers to invasive ventilation alone or 2+ other invasive organ support therapies (traditionally called ICU).
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