A client with chronic syndrome of inappropriate antidiuretic hormone (SIADH) reports to the nurse of being constantly thirsty. Which action should the nurse take?

A. Encourage the client to use hard candy frequently to help relieve thirst: Clients with SIADH are placed on fluid restriction to prevent worsening hyponatremia. Using hard candy helps relieve dry mouth and thirst without increasing fluid intake. B. Measure the client's capillary glucose reading at regular intervals: Frequent glucose monitoring is important for diabetic clients, but it is not directly related to SIADH management. Thirst in SIADH results from restricted fluids, not abnormal blood sugar levels. C. Withhold the next diuretic dose until contacting the healthcare provider: Diuretics may be used to promote free water excretion in SIADH. Withholding the dose without cause could worsen fluid retention and hyponatremia. D. Provide the client with additional oral fluids of her preference: Allowing extra fluid intake would worsen water retention and dilute serum sodium further, increasing the risk of severe hyponatremia and neurologic complications such as seizures.