Which component of the FOUR score is not part of the Glasgow Coma Scale (GCS) and helps emphasize brainstem function?

• A. Brainstem reflexes
• B. Eye response
• C. Motor response
• D. Verbal response

Answer: (A)

The main idea is that the Four Score expands evaluation beyond consciousness level by including brainstem function. The Glasgow Coma Scale focuses on how awake the patient is, using eye opening, verbal ability, and motor responses. It does not directly test brainstem reflexes, which are essential indicators of brainstem integrity. The Four Score preserves eye and motor components but adds a separate domain for brainstem reflexes—things like pupillary light reflex and corneal reflex (and related brainstem pathways)—to emphasize how well the brainstem is functioning. This distinction matters, especially when verbal responses can’t be obtained (for example, if the patient is intubated), because brainstem reflexes and respiration provide crucial information about prognosis and daily management. So the component unique to the Four Score that highlights brainstem function is the brainstem reflexes.