Which of the following describes a criterion for moderate TBI?

• A. Memory loss lasting more than 7 days
• B. Loss of consciousness for more than 30 minutes but less than 24 hours
• C. Confusion lasting less than 24 hours
• D. Dizziness lasting more than 1 day

Answer: (B)

Moderate TBI is mainly defined by the duration of loss of consciousness and the level of brain impairment it implies. If someone loses consciousness for between 30 minutes and up to 24 hours, that pattern fits the moderate range. This commonly aligns with a Glasgow Coma Scale score around 9–12 and post-traumatic amnesia lasting about 1–7 days, indicating more than a brief disruption but not a complete collapse of function.

Memories or confusion lasting longer than 7 days would push toward a more severe picture, since longer post-traumatic amnesia implies greater brain injury. Confusion that resolves within 24 hours tends to be associated with mild TBI, and dizziness that persists beyond a day isn’t a defining criterion for moderate TBI by itself.