title: Interpreting thyroid tests in the elderly: updated guidelines.
abstract: T4 determinations by themselves have been reported to be cost-effective as a screening test to identify patients with unsuspected thyroid disease. The most consistent finding in healthy older subjects, that of a decrease in circulating T3, means that reference intervals for T3 need to be adjusted downward by as much as 25%.
mesh_terms: D000368:Aged; D000375:Aging; D006801:Humans; D008875:Middle Aged; D011863:Radioimmunoassay; D013959:Thyroid Diseases / Q000175:diagnosis; D013960:Thyroid Function Tests / Q000379:methods; D013961:Thyroid Gland / Q000502:physiology; D013972:Thyrotropin / Q000097:blood; D013973:Thyrotropin-Releasing Hormone / Q000097:blood; D013974:Thyroxine / Q000097:blood; D013975:Thyroxine-Binding Proteins / Q000032:analysis; D014284:Triiodothyronine / Q000097:blood
chemical_list: D013975:Thyroxine-Binding Proteins; D014284:Triiodothyronine; D013973:Thyrotropin-Releasing Hormone; D013972:Thyrotropin; D013974:Thyroxine