Which two patient positioning guidelines are advisable for the anteroposterior (AP) humerus radiograph?

For an anteroposterior (AP) humerus radiograph, the advisable patient positioning involves either standing at the upright Bucky or lying supine on the radiographic table. Standing at the upright Bucky allows for optimal visualization of the humerus in a true AP position and is particularly useful when imaging larger patients or when their mobility is sufficient to stand without assistance. This positioning helps minimize distortion and provides a clear view of the humeral structure.

Lying supine on the radiographic table is also acceptable as it facilitates accurate imaging of the humerus while ensuring the patient's comfort. In this position, the humerus can be rotated as necessary to achieve the desired projection without the risk of artifacts or obstructions that may arise from positioning the patient differently.

These guidelines are essential for maintaining clarity in imaging and ensuring that the anatomy is accurately represented in the radiograph. The other choices may not provide appropriate visualization or could introduce complications in positioning, leading to suboptimal imaging results.