Blood Biomarkers for Identifying Epidural Hematoma in Patients Presenting with a Glasgow Coma Scale of 13-15: A Collaborative European Neurotrauma Effectiveness Research in Traumatic Brain Injury (CENTER-TBI) Study.

Triage of patients with mild traumatic brain injury (mTBI) and possible isolated epidural hematoma (iEDH) remains a clinical challenge. Blood-based biomarkers are being integrated into mTBI management, but their ability to identify patients with iEDH is uncertain. In this prospective, multicenter cohort study from the Collaborative European NeuroTrauma Effectiveness Research in Traumatic Brain Injury study, which recruited between December 19, 2014, and December 17, 2017 (NCT02210221), we included 1,048 mTBI patients (Glasgow Coma Scale ≥ 13) with biomarker sampling and head computed tomography (CT) within 24 h of injury. We assessed six blood-based biomarkers-including glial fibrillary acidic protein (GFAP) and ubiquitin carboxy-terminal hydrolase L1 (UCH-L1)-for their diagnostic performance in identifying patients with mTBI and iEDH. Patients with other traumatic intracranial findings potentially requiring surgery were excluded. Of 1,048 patients (median age 46 years; 64% male), 38 (3.6%) had iEDH and 982 (94%) had negative CT findings. GFAP showed the highest diagnostic accuracy for iEDH (area under the curve 0.77; 95% confidence interval 0.71-0.83) and yielded a negative predictive value of 1.0 at a threshold of 0.19 μg/L. The addition of UCH-L1 did not lead to a significant improvement in diagnostic performance. No significant correlation was found between EDH volume and biomarker levels. In this large multicenter study, GFAP was the only biomarker that could adequately distinguish patients with iEDH from CT-negative cases. These results suggest that GFAP may serve as a tool to rule out iEDH in patients with Glasgow Coma Scale ≥ 13, supporting its use in identifying individuals unlikely to require acute intervention for intracranial injury.