Proof of Principle for a Diagnostic Blood Test of Recurrent Seizures

Inclusion Criteria: * Male/female patients aged 12 and older * Evaluation in at least one of the following settings: * Newly referred to the University of Pennsylvania Penn Epilepsy Center. These patients may not have completed any diagnostic evaluation at Penn, other than an initial physician consultation, prior to enrollment and must agree to allow the study team to collect records regarding their diagnostic evaluations (including EEG). Diagnostic evaluations may take place at Penn or outside sites * All patients who are admitted to the University of Pennsylvania for continuous video EEG (cVEEG) monitoring Exclusion Criteria: * Patients who, in the opinion of the investigator or the patients neurologist, are unable to give Informed Consent due to mental impairment or any other reason AND do not have a LAR who can give Informed Consent on their behalf. Patients aged 12-17 (inclusive) must provide assent if they are mentally capable of doing so, and must also have a caregiver who provides Informed Consent on their behalf * Patients who, in the opinion of their neurologist at the University of Pennsylvania, are not good candidates for donating blood for any reason