Final answer:
An elevation in glucose levels can be expected in a client undergoing screening for primary Cushing's disease.
Step-by-step explanation:
The nurse should expect an elevation in glucose in a client undergoing screening for primary Cushing's disease. Cushing's disease is characterized by hypersecretion of glucocorticoids, which causes the accumulation of adipose tissue in the face and neck and excessive glucose in the blood. Glucocorticoids stimulate the synthesis of glucose and promote the release of fatty acids from adipose tissue, leading to high blood glucose levels.