How should the patient be instructed to position their body for a lateral lumbar X-ray?

For a lateral lumbar X-ray, the correct patient positioning involves having the patient stand with their arms out in front. This position ensures that the lumbar spine is well-aligned and visible without obstruction from limb positioning. By extending their arms forward, the upper body is stabilized, and the anatomical area of interest—the lumbar spine—can be accurately imaged.

Standing also allows for the natural curvature of the spine to be presented in the X-ray, which is vital for diagnostic clarity. This positioning helps to mitigate any potential overlapping shadows that might arise from the arms being positioned elsewhere. Proper arm placement not only enhances image quality but also ensures patient comfort and safety during the procedure.

Other positions, such as lying supine (face up), would not provide the lateral view required for a clear assessment of the lumbar area, while sitting with crossed legs does not facilitate proper alignment and visibility of the spine.