A 56-year-old man had a thyroid-stimulating hormone (TSH)4 value of 22.5 μIU/mL (reference interval 0.4–4.6 μIU/mL). The increased TSH prompted review of his previous thyroid testing results (Table 1). The patient's history revealed a diagnosis of papillary thyroid carcinoma 8 months prior, which was treated with total thyroidectomy and 131I radioablation followed by l-thyroxine (Synthroid) treatment. This was his first follow-up visit for evaluation of recurrence of his disease.
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- What is done to patients to enhance 131I uptake?
- What is the target TSH concentration on the day of 131I administration?
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