An elderly patient presents with new onset of confusion and a headache after a recent fall. What diagnostic test is anticipated?

In this scenario, the patient's new onset of confusion and headache following a recent fall raises concern for a potential intracranial injury, such as a subdural hematoma or a concussion. A CT scan of the brain is the most appropriate initial diagnostic test in this case because it is highly effective in quickly identifying any bleeding or structural abnormalities within the brain that could be contributing to the patient's symptoms.

CT imaging allows for immediate assessment of head injuries, which is critical, especially in elderly patients who may have a higher risk for complications and may display atypical symptoms following a fall. This rapid evaluation can guide further management, whether surgical intervention is needed or additional observation and monitoring is appropriate.

Other diagnostic tests, while useful in different contexts, do not provide the necessary information for assessing the immediate risks associated with head trauma. For example, an X-ray of the cervical spine would not directly evaluate any brain injuries. An ECG may be relevant if there are concerns about cardiac issues, and a CBC might be helpful in evaluating overall health or detecting infection but wouldn't assess potential intracranial complications. Thus, the CT scan of the brain is the most direct and relevant choice for addressing the signs and symptoms presented by the patient.