What assessment procedure should be used to test the function of CN X?

The correct assessment procedure for testing the function of cranial nerve X (vagus nerve) involves having the client open their mouth and say "aah." This technique is effective because it allows for the assessment of the uvula and soft palate, which are innervated by the vagus nerve. Observing the rise and symmetry of the soft palate during this action can indicate whether the vagus nerve is functioning properly.

When the client says "aah," the healthcare provider can assess if the uvula remains midline or if it deviates to one side, which could signify dysfunction. Additionally, this function is tested through the movement of muscles in the throat that are responsible for swallowing and speaking, further demonstrating the role of the vagus nerve in these vital processes. Thus, this method provides critical information about the neurological function associated with the vagus nerve, making it the appropriate assessment procedure.