A 28-year-old man with known Graves' disease on antithyroid drugs presents with sudden onset fever, sore throat, and severe abdominal pain. Investigations show WBC 2.8 × 10⁹/L (normal 4.5–11), neutrophils 45%, and TSH <0.01 mIU/L. What is the most appropriate next investigation to assess thyroid status and guide management?

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