What blood tests are recommended after a first seizure?

Reviewed by Yoshinori Abe, MD

Internal Medicine

After a first seizure, doctors typically order blood tests to identify potential causes such as infections, electrolyte imbalances, low blood sugar, kidney or liver dysfunction, and metabolic disorders. Common tests include a complete blood count (CBC), glucose levels, electrolytes, and toxicology screening. These results help guide diagnosis and next steps in treatment.

Because seizures can stem from many different conditions—some urgent—understanding your symptoms early is critical. A free, instant, online symptom check can help you identify possible causes, assess urgency, and decide what to do next, all in just a few minutes. Taking this quick step now can bring clarity, reduce anxiety, and help you have a more informed conversation with your doctor.

Reviewed for medical accuracy: 07/20/2026

Important Next Steps

Discover what may cause your first seizure Learn if your seizure needs urgent care Find out if it could be epilepsy See OTC options for seizure-related symptoms Find a neurologist for seizure evaluation Discover medically valid home remedies for seizures Understand likely causes of first seizure symptoms

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Explanation

Blood tests help identify underlying problems that may trigger seizures. Common tests include:

Complete blood count (CBC): Checks for infection or anemia. Electrolyte panel: Measures minerals like sodium, potassium, and calcium, as imbalances can cause seizures. Blood glucose: Low or high blood sugar can provoke seizures. Kidney and liver function tests: To assess overall health and medication metabolism. Toxicology screen: To detect drugs, alcohol, or toxins. Pregnancy test: To determine pregnancy status, as seizures during pregnancy require special care.

These tests provide clues to help guide diagnosis and treatment. If you're experiencing symptoms and want to better understand what might be causing them, try our free AI symptom checker to get personalized insights before your next medical appointment.

(References)

Krumholz A, Wiebe S, Gronseth G, Shinnar S, Levisohn P, Ting T, et al. (2007). evaluating an apparent unprovoked first seizure in adults .... Neurology, 18025394.
Sutton F, Barca D, Komoltsev I, Craiu D, Guekht A, von Oertzen T, & Cock HR. (2020). Testing blood and CSF in people with epilepsy: a practical .... Epileptic disorders : international epilepsy journal with videotape, 32782232.
Jin SJ, Lee T, Moon HE, Park ES, Lee SH, Roh YI, et al. (2023). Classification Model for Epileptic Seizure Using Simple .... Journal of clinical medicine, 37373723.

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