What GCS score indicates severe impairment of consciousness?

A GCS score of 8 or less indicates severe impairment of consciousness. The Glasgow Coma Scale (GCS) is used to assess a patient's level of consciousness by evaluating three components: eye opening, verbal response, and motor response. The total score ranges from 3 to 15, with lower scores corresponding to a more severe impairment of consciousness.

A score of 8 or less signifies that the patient is in a critical state, often indicating that they may not be able to protect their airway or respond appropriately to stimuli. This level of impairment may be observed in conditions such as severe traumatic brain injury, stroke, or other neurologic emergencies. In a clinical setting, such a score requires immediate attention, as it reflects a significant risk for respiratory compromise and potential need for advanced airway management.

Scores above 8, such as 12, 9-11, or even a perfect score of 15, indicate varying degrees of consciousness and responsiveness, which do not denote severe impairment. Thus, a GCS score of 8 or less is the definitive marker of severe consciousness impairment, necessitating urgent medical intervention.