<prompt> Answer this question truthfullyWhat is the recommended next step if a patients TSH levels are elevated?  <response>: <reason> If a patients TSH levels are elevated, the recommended next step is to perform a radioactive iodine uptake RAIU test. This test involves administering a small amount of radioactive iodine to the patient and then measuring how much of it is taken up by the thyroid gland. This test helps to determine if the elevated TSH levels are due to an overactive thyroid gland hyperthyroidism or an underactive thyroid gland hypothyroidism. Depending on the results of the RAIU test, further testing or treatment may be necessary. Elevated TSH levels can be a sign of thyroid dysfunction, which can have a variety of causes and can lead to a range of symptoms, including fatigue, weight gain or loss, and changes in heart rate and body temperature. 