Rapid diagnosis and treatment are important in the care of TBI;[6] if the injury is not diagnosed shortly after the injury, the risk of complications is higher.[18] Bronchoscopy is the most effective method to diagnose, locate, and determine the severity of TBI,[6][14] and it is usually the only method that allows a definitive diagnosis.[10] Diagnosis with a flexible bronchoscope, which allows the injury to be visualized directly, is the fastest and most reliable technique.[16] In people with TBI, bronchoscopy may reveal that the airway is torn, or that the airways are blocked by blood, or that a bronchus has collapsed, obscuring more distal (lower) bronchi from view.[3]