How Long After A Seizure Will EEG Detect It (And Why)?

Exact Answer: Within Two Days

Seizure falls under the category of neurological disorders. This disorder affects the brain and the nerves found throughout the spinal cord and the human body. Seizures are characterized by recurring epileptic seizures that are regular episodes of vigorous shaking of the body and vary from brief to undetectable to long periods.

Epileptic Seizures result in episodes that can lead to significant physical injuries such as bone damage or fatal accidents. There are no causes for seizures to occur. They are unpredictable and can happen anytime and anywhere. Poisoning also leads to few specific isolated episodes, but they are not considered under epileptic seizures.

How Long After A Seizure Will EEG Detect It

How Long After A Seizure Will EEG Detect It?

Patients are suffering from epileptic seizures experience multiple social stigmas. The mechanism of epileptic seizures is that it causes an excessive amount of neuronal activity in the brain. Such activities mainly take place in the cortex of the brain. The reasons that might lead to these seizures are still unknown, but medical experts iterate that this might be caused due to stroke, brain injury, infections of the brain, brain tumors, or brain defects. Genetic mutations might be a reason for epileptic seizures in a few patients.

Epileptic seizures are confirmed by a test called EEG, which stands for Electroencephalogram. Epileptic seizures can be controlled with the help of proper medication in approximately eighty percent of the cases. Anti-seizures medications are readily available and are not very much costly. However, suppose a patient shows no signs of improvement after taking anti-seizure medicines. In that case, the medical practitioner might recommend going for neurostimulation, surgery, or dietary changes, but they are expensive and cannot be afforded by every patient.

Time After SeizureResult Of EEG Test
Within two daysWill detect the seizure
After two daysMay fail to detect the seizure

After a person suffers an episode of an epileptic seizure, an EEG test is done to confirm it. If the test is done anywhere within the first two days, it will detect the seizure. However, if the test is done after two days, then the results might be faulty, and it may not detect the seizure.

Why Does It Take That Long After A Seizure For EEG To Detect It?

Epileptic seizures are one of the most common neurological disorders worldwide. It is a noncommunicable disease and can happen to an individual of any age. However, most of the cases are of young children or older people. Seizures, in some cases, go away naturally, while in a few instances it remains with the patients for a lifetime. It is not guaranteed that epileptic seizures will shorten the life of a patient. Medications nowadays are excellent and can control seizures up to a considerable extent.

Mostly seizures combined with any other disease lead to death. Also, as seizures can occur anywhere, it is not advised for the patients to drive a car or go to places with a vast crowd. If a person suffers from a sudden seizure episode, the person should be kept in an open-air environment. Also, it is not recommended to hold the person’s hand or leg to stop the person from shaking. It should be made sure that there are no sharp objects near the person as it can lead to self-injury.


Meditation also helps in controlling seizures. If a person takes proper precautions, then seizure episodes can be controlled to the extent that they won’t even show up for years. A person with epileptic seizures must always be with someone they can trust, as seizure episodes can occur anytime.


Overall, it can be concluded that epileptic seizure is a neurological disorder commonly occurring in young children or older people. It is caused because of improper functioning of nerves of the brain. There are two types of seizures depending on whether the cause of the seizure is known or not. Epileptic seizures can occur anytime.

On average, an EEG test successfully detects seizures within two days of testing. However, after two days, the results might come wrong.  Excellent medication is available for controlling epileptic seizures. If the medicines don’t work, then the doctor might opt for surgery. It is always advised to be with someone who can be trusted.


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Hi! I'm Nidhi.

Here at the EHL, it's all about delicious, easy recipes for casual entertaining. So come and join me at the beach, relax and enjoy the food.


  1. The limitations of the EEG test to detect seizures after two days highlight the need for continuous advancements in medical technology.

    1. Absolutely, advancements in medical technology are vital for improving epilepsy diagnosis and management.

  2. It’s concerning that seizures are not entirely predictable. More research into the causes is necessary to develop effective treatments.

  3. The complexities of epilepsy management require a collaborative and comprehensive approach to address the needs of patients.

  4. It’s important for individuals to be informed about the complexities of epileptic seizures and the safety measures to be taken in case of an episode.

  5. The link between epilepsy and the improper functioning of the brain’s nerves underscores the importance of continued research and development in this field.

  6. The potential effectiveness of medication and other control measures in managing seizures suggests hope for individuals affected by epilepsy.

  7. The challenges associated with the diagnosis and management of epilepsy highlight the need for multidisciplinary approaches to care.

    1. A multidisciplinary approach to epilepsy care is essential for addressing the diverse needs of patients.

    1. Safety and support are fundamental for improving the quality of life for individuals with epilepsy.

  8. Seizures are incredibly dangerous and can be life-threatening. Safety measures should be put in place to protect patients who suffer from epileptic seizures.

    1. I completely agree! It is important to ensure that patients are in a safe environment in the event of a seizure.

  9. The fact that the EEG test can only reliably detect seizures within two days is concerning. There is a need for more reliable diagnostic methods.

    1. There is definitely a need for more advanced diagnostic tools to improve the detection of seizures after the initial event.

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