EEG test report The top part of a routine EEG test report form contains some basic information about the patient. The middle part of the report card is what needs to be focused on, mainly including the description of various EEG waveforms, the description of abnormal EEG waves and the results of evoked tests. The EEG of normal adults consists of four basic waveforms, such as α, β, θ and δ waves, and waveforms with frequencies below 4 Hz are relatively rare. Normal children’s EEG is dominated by slow waves with a frequency of 8 Hz or less. The physician’s opinion refers to the diagnosis or the next step of management given by the doctor based on the EEG results. EEG examinations must be combined with specific clinical manifestations and cannot be used as a stand-alone diagnostic modality. Common results of EEG indicate normal results: 1. Adults: the frequency of α wave is 8-13Hz, and the amplitude is 20-100μV; the frequency of β wave is 14-25Hz, and the amplitude is 5-20μV; theta wave of 4-7Hz appears in some people; δ wave with frequency below 4Hz appears after sleep; 2. Children: slow wave with frequency below 8Hz is predominant, and with the increase of age Slow waves gradually decrease and alpha waves gradually increase, approaching adult brain waves at the age of 14-18 years. Indicates abnormal findings: diffuse slow waves, focal slow waves, triphasic waves, and abnormal waveforms in epilepsy, such as spike waves, sharp waves, 3Hz spike and slow wave synthesis, multi-spike waves, spike and slow complex waves, multi-spike and slow complex waves, high amplitude dysrhythmias, etc. What if the EEG is abnormal? The EEG alone is not able to distinguish the nature of various lesions. A small number of normal people can have abnormal EEG, while certain brain diseases may also have normal EEG. If abnormal waveforms are still present after repeated EEG examinations, a combination of clinical and other tests, such as magnetoencephalography, electroencephalographic topography, cranial CT, and MRI, is needed to clarify the diagnosis.