Case Description

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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Questions

  1. What is done to patients to enhance 131I uptake?
  2. What is the target TSH concentration on the day of 131I administration?

Read the article here for the answers.