In evaluating epilepsy, which diagnostic test is essential to demonstrate epileptic brain activity?

• A. EEG
• B. WBC count
• C. MRI
• D. Chest X-ray

Answer: (A)

Recording the brain’s electrical activity during seizures is essential to confirm epilepsy. An electroencephalogram measures cortical electrical signals and can reveal epileptiform discharges—spikes or spike-and-wave patterns—that indicate a tendency for recurrent seizures. This functional evidence of abnormal brain activity is what distinguishes epilepsy from other conditions and helps guide treatment and, if needed, localization for surgery. Imaging like MRI can show structural changes but does not by itself prove epileptic activity, and blood tests or chest X-ray don’t assess brain electrical function. So, the test that demonstrates epileptic brain activity is the EEG.