Final answer:
The exact position for observing esophageal varices during a fluoroscopy exam is not provided, but an upright or left lateral decubitus position is commonly used in related procedures.
Step-by-step explanation:
When looking for esophageal varices during a fluoroscopy exam, it is necessary for the patient to be in a specific position to allow for the best possible visualization of the esophagus. In this case, the correct position for the patient is not explicitly provided in the reference information you've supplied.
In general medical practice, however, an upright or a left lateral decubitus position is often used during endoscopic procedures to visualize esophageal varices. This helps to reduce the risk of aspiration if bleeding occurs and also uses gravity to enhance the view of the esophageal walls. For a fluoroscopy exam specifically, practices might vary and it's typically up to the performing physician’s discretion, based on the patient's condition and the medical equipment available. Consequently, it's essential to refer to the protocols of the specific medical facility and the instructions of the physician performing the exam.