A nurse is caring for a client who has hypertension and has been taking hydrochlorothiazide. Which of the following laboratory values should the nurse evaluate?

A. Coagulation studies: Hydrochlorothiazide does not typically affect coagulation parameters, making this unnecessary for routine monitoring. B. Thyroid levels: Hydrochlorothiazide does not interfere with thyroid function. C. Complete blood count: Although monitoring general blood health is important, hydrochlorothiazide primarily affects electrolytes. D. Serum electrolyte levels: Hydrochlorothiazide is a diuretic that can cause electrolyte imbalances, including hypokalemia, hyponatremia, and hypercalcemia. Regular monitoring is essential.