By Jason Hicks

TBI Severity Ratings: What "Mild" Means Clinically

An overview of traumatic brain injury severity ratings, the Glasgow Coma Scale, and why an initial classification does not by itself determine long-term symptoms.

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TBI Severity Ratings: What "Mild" Means Clinically

By Jason Hicks

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The Glasgow Coma Scale (GCS)

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01

The Glasgow Coma Scale (GCS)

A "mild" traumatic brain injury classification describes aspects of the initial clinical presentation; it does not by itself predict how long symptoms will last or how they will affect a particular person.

The Glasgow Coma Scale is one early assessment tool that measures eye, verbal, and motor responses. Diagnosis and prognosis require evaluation by qualified medical professionals using the full clinical record.

Commonly used Glasgow Coma Scale ranges and their limitations
Initial classificationCommonly used GCS rangeImportant limitation
Mild TBI13-15Symptoms and functional effects can still require follow-up evaluation.
Moderate TBI9-12Clinical findings, imaging, treatment, and recovery differ by patient.
Severe TBI3-8Immediate care needs and long-term prognosis are individual medical questions.

02

Imaging Is One Part of the Record

Standard CT or MRI findings do not answer every question about concussion symptoms or function. A treating clinician may consider the history, examination, symptom course, imaging, testing, and other records together.

Depending on the medical issues, qualified professionals may consider tools such as:

  • Advanced imaging: Used only when clinically appropriate and interpreted within its limitations.
  • Neuropsychological testing: A structured assessment that may help evaluate cognitive function when ordered and interpreted by qualified professionals.

03

Possible Ongoing Effects

Some people report symptoms or functional changes after a traumatic brain injury. The nature, cause, duration, and treatment of those effects are individual medical questions.

  • Persistent symptoms: Headache, dizziness, sleep problems, or sensory sensitivity may require follow-up care.
  • Cognitive or emotional changes: Memory, concentration, mood, and behavior concerns should be evaluated by qualified clinicians.
  • Functional effects: Work, school, driving, supervision, or daily activities may need case-specific assessment.

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