The diagnosis of TBI is done by measuring the impact of the injury on a Glasgow Coma Scale. The scale ranges from 3 to 15, higher the number, lesser the impact. When a person is admitted to the hospital due to a brain injury and if the person is awake, the first test done is to check if he/she is able to follow the directions of the nurse/doctor, move his/her eyes and limbs as instructed. Then the speech is tested. These can give important clues in assessing the extent of the damage that has happened.