Final answer:
The 13-year-old patient has a Glasgow Coma Scale (GCS) score of 11, based on his responses to verbal commands (E3), his incoherent speech (V3), and his motor response by localizing pain (M5).
Step-by-step explanation:
Glasgow Coma Scale Assessment
In assessing the 13-year-old male patient with a suspected concussion, we look at the Glasgow Coma Scale (GCS) components to evaluate his condition. The GCS consists of three parameters: eye response, verbal response, and motor response. The patient's eye-opening response is to verbal command which scores a 3 on the GCS. His verbal responses are incoherent, indicating confusion, which scores a 3. His motor response is localizing pain, meaning he pulls away or grabs at his arm when an attempt to start an IV is made, which scores a 5. Therefore, adding these scores together, the patient's GCS is 11 (E3 + V3 + M5).