Problem: A nurse is educating a patient who suffered a concussion about postconcussion syndrome. Which of the following is correct for the nurse to include? Looking for Assignment Help? Select all that apply. The best time to be evaluated for postconcussion syndrome is 24 to 48 hours after the injury. Postconcussion syndrome can affect your performance in school. The best way to prevent postconcussion syndrome is to return to normal activity as soon as possible. When signs and symptoms of concussion persist for more than 3 weeks, postconcussion syndrome has developed. A computed tomography (CT) scan will enable us to see if postconcussion syndrome has developed.