Final answer:
The nurse should instruct the UAP to position the unconscious client with aspiration risk in a semi-Fowler's position.
Step-by-step explanation:
The nurse should instruct the unlicensed assistive personnel (UAP) to position the unconscious client with at risk for aspiration in a semi-Fowler's position.
This will help reduce the risk of aspiration by promoting the drainage of oral secretions and preventing them from pooling in the back of the throat.
The semi-Fowler's position involves elevating the head of the bed to approximately 30 degrees, which helps maintain a patent airway.