Assay-dependent variability in free thyroxine (FT4): differential interference related to immunoassay design in a patient with subclinical hypothyroidism
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In clinical practice, thyroid function tests (TFTs) usually comprise thyroid-stimulating hormone (TSH) and free thyroxine (FT4), with free triiodothyronine (FT3) measured less frequently. We report a 76-year-old woman with autoimmune thyroiditis presenting wit... ...
