Electroencephalogram (EEG) Test
Imaging & Scans
≈ ¥200-500
(≈ $30-70)
30 min
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Description
Estimated cost for Electroencephalogram (EEG) Test at general public hospitals in China is about ¥140-400, and at Grade 3A hospitals about ¥200-500, varying by hospital tier and region.
Main Uses
EEG is primarily used to diagnose and monitor seizure disorders, evaluate brain function in comatose patients, study sleep disorders, and investigate other conditions affecting brain function like dementia, head injuries, and infections. It is also used to confirm brain death.
Normal Range
A normal EEG (Electroencephalogram) does not have a specific numerical range but is characterized by the presence of typical brain wave patterns. These include alpha, beta, theta, and delta waves, each with their own frequency ranges: Alpha waves (8-12 Hz), Beta waves (13-30 Hz), Theta waves (4-7 Hz), and Delta waves (0.5-3 Hz). The appearance and distribution of these waves vary depending on the individual's age and state (awake, asleep, etc.).
Low Values - Possible Causes
Low amplitude or absence of certain brain waves can be caused by: Hypoglycemia, Sedative medications, Deep anesthesia, Severe hypothermia, Brain atrophy
High Values - Possible Causes
High amplitude or excessive slow waves may indicate: Epileptic activity, Encephalitis, Brain tumors, Stroke, Metabolic disturbances such as hepatic encephalopathy