Final answer:
The next step for a patient diagnosed with hypothyroidism with elevated TSH and decreased free T4 is often to begin medication therapy with thyroid hormone supplements, closely monitoring and adjusting as needed.
Step-by-step explanation:
When a patient presents with labs indicating elevated TSH and decreased free T4, and has been diagnosed with hypothyroidism, the next step often involves starting medication therapy. The medication typically used is a thyroid hormone supplement to replace the insufficient thyroid hormones and alleviate the symptoms of hypothyroidism, such as fatigue and weight gain. These levels must be carefully monitored and adjusted as necessary to ensure proper metabolism and overall health.