A nurse is reinforcing education for the parents of a client with hypothyroidism who has been prescribed levothyroxine (Synthroid). The nurse should reinforce the ongoing need for which of the following monitoring or screenings?

A. Regular monitoring of blood pressure: While levothyroxine can affect cardiovascular function, routine blood pressure monitoring is not the primary method for assessing therapeutic effectiveness in hypothyroidism. Blood pressure checks may be part of general health monitoring but are not specific to thyroid management. B. Routine monitoring of thyroid-stimulating hormone (TSH) levels: TSH levels provide the most reliable indicator of thyroid hormone replacement adequacy. Regular TSH monitoring helps ensure the levothyroxine dose is therapeutic, preventing under- or overtreatment, which could lead to hypothyroid or hyperthyroid complications. C. Frequent assessments of blood glucose levels: Levothyroxine does not directly affect glucose metabolism, so routine blood glucose monitoring is not necessary unless the patient has concurrent diabetes or risk factors. It is not a standard screening for hypothyroidism management. D. Continuous monitoring of body temperature: Body temperature may be affected by thyroid hormone levels, but continuous monitoring is not practical or necessary. TSH and clinical assessment provide more accurate and actionable information regarding therapy effectiveness.