A nurse is caring for a client who has a suspected brain tumor. Which of the following diagnostic tests should the nurse understand is most frequently used to diagnose brain tumors?

Choice A reason: Blood tests for tumor markers are not primary for brain tumors, as few reliable markers exist. Imaging like CT is standard, making this incorrect for frequent diagnosis. Choice B reason: A CT scan is the most frequently used test to diagnose brain tumors, providing detailed brain imaging to detect masses. This is standard practice, making it the correct choice. Choice C reason: Phalen’s test diagnoses carpal tunnel syndrome, not brain tumors. It’s unrelated to neurological imaging, making this incorrect for diagnosing suspected brain tumors. Choice D reason: Burr holes are a surgical intervention, not a diagnostic test. CT scans are non-invasive and primary for tumor detection, making this incorrect for diagnosis.