title: Spuriously high free thyroxine with the Amerlite MAB FT4 assay.
abstract: In the Amerlite MAB FT4 assay, as stated by the manufacturer, FT4 values should be normal in patients with anti-thyroid hormone autoantibodies. The case of a 69 year old woman with a spuriously high FT4 using the Amerlite MAB FT4 assay is reported. Laboratory investigations showed that her spurious FT4 result was likely to have been caused by anti-thyroid hormone autoantibodies.
authors.affiliation: Department of Clinical Biochemistry, Freeman Hospital, Newcastle upon Tyne.
authors.forename: L C
authors.initials: LC
authors.lastname: Lai
authors.forename: J A
authors.initials: JA
authors.lastname: Day
authors.forename: F
authors.initials: F
authors.lastname: Clark
authors.forename: R T
authors.initials: RT
authors.lastname: Peaston
mesh_terms: D000368:Aged; D000911:Antibodies, Monoclonal; D001323:Autoantibodies / Q000097:blood*; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D013963:Thyroid Hormones / Q000276:immunology*; D013974:Thyroxine / Q000097:blood*
chemical_list: D000911:Antibodies, Monoclonal; D001323:Autoantibodies; D013963:Thyroid Hormones; D013974:Thyroxine