Final answer:
Respiratory distress indicates an allergic reaction in a preschooler following an abdominal CT scan with contrast dye. It's important to seek medical attention for proper management of potential allergic reactions.
Step-by-step explanation:
Following an abdominal CT scan with contrast dye, an allergic reaction in a preschooler may be indicated by respiratory distress. This symptom can be part of the body's response to allergens, leading to swollen airways, increased breathing difficulty, and potentially life-threatening conditions if left untreated. Therefore, when a preschooler shows signs of respiratory distress after a CT scan with contrast dye, it is crucial to monitor the situation carefully and seek medical attention promptly to address any possible allergic reactions.