Final answer:
The sign or symptom that would most likely cause an EMT to mistake a head injury for an abdominal injury in a child is lethargy.
Step-by-step explanation:
The sign or symptom that would most likely cause an EMT to mistake a head injury for an abdominal injury in a child is lethargy.
Lethargy refers to a state of extreme tiredness and lack of energy. In the context of a head injury, lethargy can be a result of an increase in intracranial pressure, which can also cause vomiting.
When a child with a head injury exhibits lethargy and vomiting, an EMT may mistakenly suspect an abdominal injury due to the presence of vomiting, which is commonly associated with abdominal issues.