PRL and epilepsy: Transient PRL elevations were found in 70% of TCS, consistent with previous studies.5, 40, 41 In contrast, CK elevations were only detected in ~10% of TCS, which is surprisingly low as compared to results of ER studies reporting relevant CK elevations in 40%‐60% of TCS.3, 4 However, previous studies in the setting of an epilepsy monitoring unit reported significant CK elevations after 14%‐19% of the TCS, which questions the predictive diagnostic value of CK elevations.40, 41 It is unknown why CK levels are higher in ER studies than in video‐EEG monitoring studies.