Which score reflects the least responsiveness in a GCS assessment?

In the Glasgow Coma Scale (GCS), scores range from 3 to 15, with lower scores indicating decreased levels of consciousness and responsiveness. A score of 1 reflects no verbal response, no eye-opening, and no motor response, which indicates the most severe impairment in consciousness. It represents a total lack of responsiveness to stimuli, making it the lowest score possible on the GCS scale.

In contrast, a score of 3 indicates some limited responses, such as a motor reaction to painful stimuli or minimal verbal response, but is still considered very low in terms of consciousness. A score of 5 typically indicates a higher level of responsiveness, including some verbal communication or eye-opening. A score of 6 represents more consistent but still limited reactions, such as following commands.

Thus, the correct answer is the score of 1, as it clearly indicates the least responsiveness in a GCS assessment.