Glasgow Outcome Scale (GOS)

The Glasgow Outcome Scale (developed at the University of Glasgow in 1975 as a logical extension of the Glasgow Coma Scale) is a standardized classification system applied for the assessment of long-term treatment outcomes and recovery levels in patients who have experienced severe traumatic brain injuries.

Etiology and pathophysiology

The process of neural tissue recovery (neuroplasticity) after extensive damage is extremely heterogeneous. It depends on the extent of the initial damage, the degree of surgical intervention, and the intensity of rehabilitation. Unlike clinical neurological tests, which measure muscle strength or reflexes, this scale focuses on a person’s overall social and domestic independence.

The scale allows for an objective evaluation of how well the recovered brain functions enable a patient to reintegrate into society, whether they require permanent external care, and if they can return to previous work.

Clinical significance

Assessment using this scale is traditionally conducted during the recovery period — 6 or 12 months post-injury. The classic version of the scale divides all patients into five distinct outcome categories:

1. Death.
2. Vegetative state (the patient breathes and opens eyes but is fully unconscious and unresponsive to the external environment).
3. Severe disability (the patient is conscious but entirely dependent on daily care from others).
4. Moderate disability (the patient is independent in daily life, can use transport, but possesses deficits that hinder full performance in work).
5. Good recovery (return to normal social and professional life with minimal residual symptoms).

This scale serves as a global standard for conducting clinical trials in neurosurgery, facilitating the validation of new treatments or surgical methods.