Final answer:
The appropriate exam to order for a suspected spiral tibia fracture is an X-ray.
Step-by-step explanation:
If a patient presents with a suspected spiral tibia fracture, the appropriate exam to order would be an X-ray of the affected area. X-rays are commonly used to diagnose fractures and can provide detailed images to determine the extent and location of the fracture. They can also help with assessing any displacement or angulation of the fractured bone.
In some cases, additional imaging exams such as CT scans or MRI scans may be ordered to provide more information if the fracture is complex or if there are other associated injuries.