A nurse is caring for a client who has hypokalemia, hyperglycemia, and hypertension. A diagnosis of Cushing syndrome is suspected. Which of the following tests would the nurse anticipate the health care provider will order to help confirm the diagnosis of Cushing syndrome?

A. B-type natriuretic peptide (BNP): BNP levels are elevated in heart failure due to increased pressure and stretch in the heart's chambers. It is a key marker used to diagnose and assess the severity of heart failure.
B. Troponin I: This marker is used to diagnose myocardial infarction (heart attack) rather than heart failure. Elevated troponin levels indicate damage to the heart muscle.
C. Blood urea nitrogen (BUN): BUN levels can be elevated in heart failure due to decreased renal perfusion, but it is not as specific for diagnosing heart failure as BNP.
D. Platelet levels: Platelet levels are not directly related to the diagnosis of heart failure. They are more relevant for assessing clotting disorders and other conditions.

A. "You may need to repeat this therapy again in three weeks if the first dose doesn't achieve optimal results": Radioactive iodine therapy may require additional doses, but this is not determined by a set timeframe such as three weeks. The need for additional therapy is based on the individual’s response and thyroid function tests.
B. "Avoid being close to pregnant women and children for 7 days after your treatment": This is correct as radioactive iodine therapy can emit radiation, and avoiding close contact with vulnerable populations such as pregnant women and children helps minimize their exposure to radiation.
C. "You may need to begin corticosteroid replacement therapy after this treatment": This is incorrect because corticosteroid replacement is not typically required after radioactive iodine therapy for Graves' disease. The treatment primarily targets the thyroid gland.
D. "The purpose of this therapy is to increase your levels of thyroid hormone": This is incorrect. The purpose of radioactive iodine therapy is to reduce thyroid hormone production by destroying thyroid tissue, which helps to manage hyperthyroidism in Graves' disease.