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Correlation between FT3/FT4 ratio and TRAb. (a) shows FT3/FT4 ratios for different TRAb titers in patients with Graves' disease as well as the FT3/FT4 ratios for patients with painless thyroiditis and subacute thyroiditis. (b) shows correlation between FT3/FT4 ratio and TRAb titer.
