Which type of test should be performed swiftly for a casualty with signs of TBI?

The assessment for "red flag" signs is the appropriate test to be performed swiftly for a casualty with signs of traumatic brain injury (TBI) because this type of assessment focuses on identifying potentially life-threatening conditions that require immediate attention. "Red flags" include critical symptoms such as loss of consciousness, significant confusion, severe headache, or any signs of deteriorating neurological status. Swift recognition of these signs can be crucial for initiating timely interventions that could prevent further complications or worsening of the casualty’s condition.

In contrast, a basic physical examination, while important, may not yield immediate information about the severity of TBI in the time-sensitive context of combat care. A visual acuity test and a cognitive function test, although useful in evaluating specific aspects of brain function, are not prioritized in situations where rapid assessment of potentially critical symptoms is necessary to guide urgent care decisions. Thus, focusing on "red flags" ensures that the most pressing concerns are addressed first.