Online resources do not definitively test that concussion has occurred. Concussions do not always cause a loss of consciousness and may not produce immediate symptoms, according to WebMD. Any person suspected of a having a concussion should see a doctor.
Concussion occurs when the brain bumps into the bones of the skull due to a large force to the head or neck, notes MedicineNet. A transient loss of consciousness following an injury is a clear indicator that an individual has suffered concussion. However, a loss of consciousness does not occur in most concussion cases.
A doctor must perform a neuropsychological test to determine whether or not concussion has occurred, advises WebMD. A CT scan or MRI rules out any incidence of physical damage to the brain.