Which of the following is administered to prepare for 67Ga-citrate imaging?

In the context of preparing for 67Ga-citrate imaging, the correct preparation involves the use of laxatives. The primary reason for this is to reduce the gastrointestinal (GI) activity that can interfere with the interpretation of the imaging results. The presence of stool in the intestines can lead to increased background activity, making it more challenging to visualize and differentiate between normal and abnormal findings, particularly when assessing for malignancies or infections.

By ensuring that the bowel is clear through the administration of laxatives, the accuracy of the scan is increased. This is especially important because 67Ga-citrate has an affinity for tissues that may be affected by disease processes, and the goal is to enhance the clarity and diagnostic value of the imaging.

Other options, while they may have their own uses in different settings, do not serve the same purpose in the context of 67Ga-citrate imaging. For instance, Lugol's solution is often used to block thyroid uptake and is unrelated to bowel preparation. Diuretics are used to promote urination and may have a role in specific imaging protocols but do not prepare the GI tract. Potassium perchlorate is typically employed to reduce thyroid uptake of certain radiopharmaceuticals and does not aid in GI clearance.