PMID: 6411395Aug 1, 1983Paper

Free thyroid hormone concentrations in subjects with various abnormalities of binding proteins: experience with amerlex free-T4 and free-T3 assays

Clinical Endocrinology
P G ByfieldR L Himsworth

Abstract

Free thyroid hormone concentrations measured by Amerlex assays were studied in subjects with inherited disorders of thyroxine-binding globulin (TBG) synthesis, variant albumins with a high avidity for T4, and iodothyronine-binding autoantibodies. Free T4 (fT4) and free T3 (fT3) levels were normal in euthyroid subjects with TBG deficiency and excess. Free T3 concentration was in the low normal range in subjects having a variant albumin but fT4 (Amerlex) was erroneously elevated because of the enhanced affinity of the 125I-T4 analogue employed in the assay for the abnormal albumin. The 125I-T3 analogue used in the fT3 assay does not bind more strongly to this variant albumin than to normal albumin. Amerlex assays for fT4 and fT3 in patients with iodothyronine-binding autoantibodies to thyroglobulin give variable results according to the specificity of the autoantibodies: non-specific antibodies cause extraordinarily high values even in hypothyroid patients; fT3 measurements may be appropriate in patients with T4-specific antibodies and even in some with T3-specific antibodies. The presence of such antibodies should be suspected if the results of Amerlex assays for fT4 and fT3 are discordant or are inconsistent with the clinical p...Continue Reading

References

Dec 1, 1976·The Journal of Clinical Endocrinology and Metabolism·H BürgiT Lemarchand-Béraud
Oct 9, 1982·Lancet·D J AllanJ E Midgley
Jan 3, 1983·Life Sciences·R L HimsworthS Copping
Dec 1, 1982·The Biochemical Journal·P G ByfieldR L Himsworth
Jan 1, 1983·Clinical Endocrinology·M R LallozR L Himsworth
Sep 1, 1981·Clinical Endocrinology·J R StockigtD M Hurley
Jul 1, 1981·Clinical Endocrinology·C J PearceR L Himsworth

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Citations

Jan 1, 1987·Critical Reviews in Clinical Laboratory Sciences·G H White
Oct 1, 1984·Clinical Endocrinology·M R LallozR L Himsworth
Dec 1, 1984·British Medical Journal
Sep 1, 1984·Scandinavian Journal of Clinical and Laboratory Investigation·G LindstedP A Lundberg
Dec 1, 1987·Journal of Endocrinological Investigation·S BenvengaJ Robbins
May 1, 1986·Annals of Clinical Biochemistry·C J Pearce, P G Byfield
Jan 1, 1986·Annals of Clinical Biochemistry·M F StewartI Roberts

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