Final answer:
For bronchoscopy preparation, patients should be NPO for 4 to 8 hours and avoid eating until the gag reflex returns; bowel preparation is not necessary.
Step-by-step explanation:
When instructing a client about bronchoscopy preparation, it is essential to ensure that the patient understands how to prepare properly to minimize risks such as aspiration. The correct instructions should include being NPO (nothing by mouth) for 4 to 8 hours before the procedure to reduce the risk of aspiration. Additionally, patients should avoid eating until their gag reflex returns post-procedure to reduce the risk of choking or aspiration. Bowel preparation is not required for a bronchoscopy as it pertains to the respiratory system, not the digestive tract.