15 August. The MEDiscuss CDSS is soft-launching today, built for the units, the drugs and the guidance we actually use in Indian wards.

Glasgow Coma Scale (GCS) & GCS-P

Neurological Assessment, Pupillary Reactivity & Clinical Disposition · v1
How to use this tool: Record the best response in each of the three domains. Where a domain cannot be tested, for example in an intubated patient or with severe periorbital oedema, mark it Not Testable and the total score is adjusted.

1. Patient Characteristics

2. Clinical Context & Confounders

3. Glasgow Coma Scale Parameters

Clinical Interpretation & Indian Context

1. The Evolution of the GCS

The Glasgow Coma Scale was first described in 1974 by Teasdale and Jennett. It remains the gold standard for assessing the depth and duration of impaired consciousness. However, the traditional score does not account for brainstem reflexes.

2. GCS-P: Incorporating Pupillary Reactivity

The GCS-Pupils (GCS-P) score integrates brainstem function with the standard GCS. It is calculated by subtracting the Pupillary Reactivity Score (PRS) from the GCS total:

  • PRS 0: Both pupils react.
  • PRS 1: One pupil reacts.
  • PRS 2: Neither pupil reacts.

Why it matters: A GCS of 3 with bilateral fixed pupils (GCS-P 1) carries a significantly worse mortality profile than a GCS of 3 with reactive pupils (GCS-P 3).

3. Confounding Factors in the Ward and ICU

Confounder Clinical Strategy
Intubation & Sedation Do not assign a score of 1 to Verbal if the patient is intubated. Assign "NT" (Not Testable) and append a "T" to the score (e.g., E4 VT M6). Daily sedation pauses are critical to establish a true baseline.
Periorbital Oedema Common in severe maxillofacial trauma. Do not assign an Eye score of 1. Mark as "NT" with modifier "C" (Closed).
Aphasia / Dementia Record the best baseline function. A patient with severe baseline aphasia cannot score a Verbal 5, but changes from their baseline indicate acute deterioration.

4. Relevance in the Indian Context

According to Indian epidemiological data, road traffic accidents account for a vast majority of severe TBI presentations. Delayed transport to definitive neurosurgical centres often exacerbates secondary brain injury (hypoxia and hypotension). Strict adherence to basic airway protection protocols in the primary centre before transfer is essential. Furthermore, in non-traumatic encephalopathies (like hepatic encephalopathy or severe CNS tuberculosis), the GCS trend over hours is far more predictive of outcome than a single measurement.

Abbreviations: GCS (Glasgow Coma Scale) · GCS-P (Glasgow Coma Scale – Pupils Score) · PRS (Pupil Reactivity Score) · E (Eye Opening) · V (Verbal Response) · M (Motor Response) · NT (Not Testable) · TBI (Traumatic Brain Injury) · ICP (Intracranial Pressure) · CNS (Central Nervous System) · RTA (Road Traffic Accident) · ETT (Endotracheal Tube)
Algorithm References & Evidence Base
  1. Teasdale G, Jennett B. Assessment of coma and impaired consciousness. A practical scale. Lancet. 1974;2(7872):81-84.
  2. Brennan PM, Murray GD, Teasdale GM. Simplifying the use of prognostic information in traumatic brain injury. Part 1: The GCS-Pupils score... J Neurosurg. 2018;128(6):1612-1620.
  3. Agrawal A, Galwankar S, Kapil V, et al. Epidemiology and clinical characteristics of traumatic brain injury in rural India. Indian J Surg. 2012;74(1):21-25.
  4. Sharma R, Singh R, et al. Profile of traumatic brain injury in an Indian tertiary care centre. Neurol India. 2019;67(4):1042-1048.
How to Cite This Tool

AMA Style:
Umakanth S. Glasgow Coma Scale (GCS) & Neurological Assessment Pathway. MEDiscuss. Published 2026. Accessed .

Vancouver Style:
Umakanth S. Glasgow Coma Scale (GCS) & Neurological Assessment Pathway [Internet]. MEDiscuss.org; 2026 [cited ]. Available from:

Disclaimer and scope
Disclaimer: This decision-support system is intended for healthcare professionals. It does not substitute clinical judgment. These algorithms are evidence-based, but medical knowledge evolves continuously. The treating physician retains absolute responsibility for all diagnostic, dosing, and therapeutic decisions. Always verify outputs against current institutional protocols and individual patient contexts.
© 2026 MEDiscuss.org. All rights reserved. This CDSS Module was designed and developed by
Dr. Shashikiran Umakanth using the available evidence base. Provided free of charge for clinical use. Unauthorised reproduction or redistribution is strictly prohibited.
Category Risk Scores & Diagnostic Pathways
Specialties Internal Medicine, Critical Care
Written and maintained by Dr Shashikiran Umakanth.
Last revised: 29 July 2026
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