Which domains are assessed by the FOUR score, and when is it typically used instead of the Glasgow Coma Scale (GCS)?

• A. Eye response, motor response, brainstem reflexes, and level of respiration
• B. Verbal response, eye opening, pupil size, and limb movement
• C. Cognitive function, gait, sensation, reflexes
• D. Overall consciousness, orientation, communication, arousal

Answer: (A)

The main idea here is that the FOUR score evaluates coma by looking at four specific domains that reflect both cortical and brainstem function. It includes eye response and motor response, just like the GCS, but adds two crucial components: brainstem reflexes and respiration. This combination lets clinicians assess brainstem integrity and breathing patterns even when the patient cannot be scored reliably on verbal response.

That’s why the correct answer points to eye response, motor response, brainstem reflexes, and respiration. In practice, the FOUR score is especially useful when the Glasgow Coma Scale isn’t fully applicable—most often in intubated patients or those with severe facial trauma—because you can’t reliably measure verbal response. The brainstem reflexes and respiration parts provide important information about the patient’s level of consciousness and brainstem function in those situations.

The other options mix in elements that aren’t part of the FOUR score—verbal response, pupil size, gait, or general orientation and arousal—so they don’t describe the FOUR score domains.