What is the minimum Glasgow Coma Scale (GCS) score that defines severe head injury according to ATLS guidelines?

Question

Accepted Answer

A. GCS ≤ 8. ## Glasgow Coma Scale (GCS) Classification in Head Injury

**Key Point:** Severe head injury is defined as GCS ≤ 8. This threshold mandates airway protection and ICU-level monitoring.

### GCS Score Stratification

| GCS Range | Severity | Management Implication |
| --- | --- | --- |
| 13–15 | Mild | Observation, CT if high-risk features |
| 9–12 | Moderate | ICU monitoring, consider intubation |
| ≤ 8 | Severe | Intubate, airway protection mandatory, ICU care |

**High-Yield:** A GCS of 8 or less indicates inability to protect the airway and is the threshold for **immediate intubation** in trauma protocols. This is a critical decision point in ATLS.

**Clinical Pearl:** The GCS is calculated as Eye Opening (E: 1–4) + Verbal Response (V: 1–5) + Motor Response (M: 1–6). A score of 8 represents the minimum sum at which airway reflexes are considered unreliable.

**Mnemonic:** **SEVERE = 8 or less** — Remember that GCS ≤ 8 = **S**evere, requiring **E**ndotracheal intubation and **V**entilatory support in an **E**mergency **R**oom or **E**mergency ICU setting.

![Head Injury — GCS and Management diagram](https://mmcphlazjonnzmdysowq.supabase.co/storage/v1/object/public/blog-images/explanation/4126.webp)

Answer

B. GCS ≤ 14

Answer

C. GCS ≤ 12

Answer

D. GCS ≤ 10

What is the minimum Glasgow Coma Scale (GCS) score that defines severe head injury according to ATLS guidelines?

Explanation

Glasgow Coma Scale (GCS) Classification in Head Injury

GCS Score Stratification

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GCS Range	Severity	Management Implication
13–15	Mild	Observation, CT if high-risk features
9–12	Moderate	ICU monitoring, consider intubation
≤ 8	Severe	Intubate, airway protection mandatory, ICU care