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In older adults, thyroid-stimulating hormone (TSH) concentrations are raised and higher free thyroxine (FT4) is associated with poorer health outcomes. As use of nonage-appropriate reference ranges could lead to suboptimal management, we aimed to define reference intervals for TSH and FT4 in older men.

Reference Ranges for Thyroid-Stimulating Hormone and Free Thyroxine in Older Men: Results From the Health In Men Study