What is the primary instruction for patients during an AP cervical X-ray?

The primary instruction for patients during an AP (anterior-posterior) cervical X-ray is to remain still, hold their breath, and not swallow.

Remaining still is crucial for obtaining a clear and accurate image of the cervical spine, as any movement can result in blurriness that compromises diagnostic quality. Holding the breath helps to minimize any respiratory motion that could also contribute to image distortion. Not swallowing is important because swallowing can cause movement in the cervical region and alter the positioning of the structures being imaged.

While other choices may include relevant actions, they either add unnecessary elements or incorrect details that can distract from the essential instructions required for the procedure. This makes the second option the most accurate and focused response for ensuring optimal imaging results.