Hi,
Any concussion that causes loss of consciousness, slurred speech, nausea and vomiting, headache, dizziness, incoordination, loss of balance all or one of these symptoms should be evaluated by a doctor.
The results of a physical and neurologiocal exam will help in deciding if a CT scan needs to be done or not.
Hi there.
Any form of concussion ideally should be evaluated by at the emergency room by emergency room physicians, and later admitted for observation about 24-48 hours since neurologic symptoms can still ensue (like weakness, vomiting, decrease consciousness, etc.).
A CT scan is not mandatory for concussion, however this should be done for any person with neurologic symptoms such as preferential weakness of one part of the body, severe headache, or decreasing sensorium. Unconsciousness is not a full proof indication for a CT scan.