EEG for Epilepsy in Sydney
Same-day expert evaluation. Standard and sleep-deprived EEG. Fellowship-trained neurologist.
How EEG Helps in Epilepsy
EEG is the single most useful test in the workup of suspected epilepsy. It supports diagnosis, classifies the epilepsy type, and helps guide treatment.
Detects Epileptiform Discharges
Spikes, sharp waves and spike-and-wave patterns that point to an underlying tendency to seizures. These can be present even between seizures.
Classifies the Epilepsy
Focal or generalised? Frontal, temporal, or occipital onset? EEG localises the abnormality, which directly influences which anti-seizure medication is most likely to work.
Monitors Treatment
Repeat EEG can confirm whether discharges are settling on treatment, or investigate breakthrough seizures and medication changes.
Types of Epilepsy EEG Helps Diagnose
EEG findings differ between epilepsy syndromes. Recognising the pattern is part of the diagnosis.
Including temporal lobe, frontal lobe, parietal and occipital onset seizures.
Including juvenile myoclonic epilepsy and absence epilepsy.
EEG helps estimate recurrence risk and guides whether to start treatment.
Distinguishing absence seizures from inattention or daydreaming.
Distinguishing nocturnal seizures from parasomnias and movement disorders.
Investigating control loss on existing treatment.
Standard vs Sleep-Deprived EEG for Epilepsy
A normal routine EEG does not rule epilepsy out. Sleep-deprived EEG significantly increases the yield.
Routine (awake) EEG — about 40 minutes
Captures about half an hour of awake brain activity. May include hyperventilation and photic stimulation to provoke discharges. First-line test in most patients with suspected epilepsy.
Sleep-deprived EEG — about an hour
You stay awake most of the night before the test. Sleep deprivation and natural sleep during the recording bring out epileptiform discharges that may have been missed on routine EEG. Often the second step when the first EEG is normal but clinical suspicion remains high.
Repeat EEG when needed
Some epilepsies require more than one recording to show their characteristic pattern. We arrange repeat testing efficiently — no long waitlists.
Frequently Asked Questions
Can EEG diagnose epilepsy on its own?
Epilepsy is a clinical diagnosis. EEG supports it by detecting epileptiform discharges and classifying seizure type, but a normal EEG does not rule epilepsy out and an abnormal EEG must always be interpreted alongside your symptoms and history.
Why might a routine EEG be normal in epilepsy?
Routine EEG only samples about 30 minutes of brain activity. Abnormal discharges may not appear in that window. Sleep-deprived EEG or repeat EEG significantly increases the chance of detecting epileptiform activity.
What does an epileptiform discharge look like?
Brief, sharp spikes or spike-and-wave patterns that stand out from your background brain rhythms. Your neurologist identifies their location and type to help classify the epilepsy.
How does EEG help guide epilepsy treatment?
EEG findings help classify epilepsy as focal or generalised, which directly influences which anti-seizure medication is most likely to work. EEG also helps monitor response to treatment and investigate breakthrough seizures.
How soon can I get an EEG for suspected epilepsy?
Standard and sleep-deprived EEG are usually available within days, not weeks. Your neurologist analyses the recording the same day and reports back to your GP that evening.
Ready to Book Your Epilepsy EEG?
Same-day expert reporting. No long wait times. Bondi Junction.