1: Kang GY, Parks JR, Fileta B, Chang A, Abdel-Rahim MM, Burch HB, Bernet VJ. Thyroxine and triiodothyronine content in commercially available thyroid health supplements. Thyroid. 2013 Oct;23(10):1233-7. doi: 10.1089/thy.2013.0101. Epub 2013 Sep 14. PubMed PMID: 23758055. 2: Bunevicius R, Kazanavicius G, Zalinkevicius R, Prange AJ Jr. Effects of thyroxine as compared with thyroxine plus triiodothyronine in patients with hypothyroidism. N Engl J Med. 1999 Feb 11;340(6):424-9. PubMed PMID: 9971866.
3: Bolk N, Visser TJ, Kalsbeek A, van Domburg RT, Berghout A. Effects of evening vs morning thyroxine ingestion on serum thyroid hormone profiles in hypothyroid patients. Clin Endocrinol (Oxf). 2007 Jan;66(1):43-8. PubMed PMID: 17201800.
4: Buitendijk M, Galton VA. Is the kidney a major storage site for thyroxine as thyroxine glucuronide? Thyroid. 2012 Feb;22(2):187-91. doi: 10.1089/thy.2011.0307. Epub 2011 Dec 16. PubMed PMID: 22175240; PubMed Central PMCID: PMC3271371.
5: Wani TA, Zargar S, Majid S, Darwish IA. Analytical Application of Flow Immunosensor in Detection of Thyroxine and Triiodothyronine in Serum. Assay Drug Dev Technol. 2016 Nov;14(9):535-542. Epub 2016 Nov 1. PubMed PMID: 27801595.
6: Braverman LE, Vagenakis A, Downs P, Foster AE, Sterling K, Ingbar SH. Effects of replacement doses of sodium L-thyroxine on the peripheral metabolism of thyroxine and triiodothyronine in man. J Clin Invest. 1973 May;52(5):1010-7. PubMed PMID: 4700481; PubMed Central PMCID: PMC302354.
7: Liewendahl K, Helenius T, Lamberg BA, Mähönen H, Wägar G. Free thyroxine, free triiodothyronine, and thyrotropin concentrations in hypothyroid and thyroid carcinoma patients receiving thyroxine therapy. Acta Endocrinol (Copenh). 1987 Nov;116(3):418-24. PubMed PMID: 3687325.
8: Hennemann G, Docter R, Krenning EP, Bos G, Otten M, Visser TJ. Raised total thyroxine and free thyroxine index but normal free thyroxine. A serum abnormality due to inherited increased affinity of iodothyronines for serum binding protein. Lancet. 1979 Mar 24;1(8117):639-42. PubMed PMID: 85873.
9: Larsen PR, Atkinson AJ Jr, Wellman HN, Goldsmith RE. The effect of diphenylhydantoin on thyroxine metabolism in man. J Clin Invest. 1970 Jun;49(6):1266-79. PubMed PMID: 4987171; PubMed Central PMCID: PMC322591.
10: Walsh JP. Dissatisfaction with thyroxine therapy - could the patients be right? Curr Opin Pharmacol. 2002 Dec;2(6):717-22. Review. PubMed PMID: 12482736.
11: Cassio A, Cacciari E, Cicognani A, Damiani G, Missiroli G, Corbelli E, Balsamo A, Bal M, Gualandi S. Treatment for congenital hypothyroidism: thyroxine alone or thyroxine plus triiodothyronine? Pediatrics. 2003 May;111(5 Pt 1):1055-60. PubMed PMID: 12728088.
12: Kaptein EM, Moore GE, Ferguson DC, Hoenig M. Thyroxine and triiodothyronine distribution and metabolism in thyroxine-replaced athyreotic dogs and normal humans. Am J Physiol. 1993 Jan;264(1 Pt 1):E90-100. PubMed PMID: 8430792.
13: Huang WS, Cherng SC, Wang CH, Shih BF, Kuo SW, Wu SY. Increased urinary thyroxine sulfate excretion in thyroxine therapy. Endocr J. 1997 Aug;44(4):467-72. Erratum in: Endocr J 1997 Oct;44(5):following 764. PubMed PMID: 9447277.
14: Hillier AP. Autoregulation of thyroxine secretion into bile. J Physiol. 1972 Mar;221(2):471-6. PubMed PMID: 5020987; PubMed Central PMCID: PMC1331344.
15: Senese R, Cioffi F, de Lange P, Goglia F, Lanni A. Thyroid: biological actions of 'nonclassical' thyroid hormones. J Endocrinol. 2014 Apr 22;221(2):R1-12. doi: 10.1530/JOE-13-0573. Print 2014 May. Review. PubMed PMID: 24464019.
16: Jennings PE, O'Malley BP, Griffin KE, Northover B, Rosenthal FD. Relevance of increased serum thyroxine concentrations associated with normal serum triiodothyronine values in hypothyroid patients receiving thyroxine: a case for "tissue thyrotoxicosis". Br Med J (Clin Res Ed). 1984 Dec 15;289(6459):1645-7. PubMed PMID: 6439358; PubMed Central PMCID: PMC1443837.
17: Banks WA, Kastin AJ, Michals EA. Transport of thyroxine across the blood-brain barrier is directed primarily from brain to blood in the mouse. Life Sci. 1985 Dec 23;37(25):2407-14. PubMed PMID: 4079655.
18: Massart C, Elbadii S, Gibassier J, Coignard V, Rasandratana A. Anti-thyroxine and anti-triiodothyronine antibody interferences in one-step free triiodothyronine and free thyroxine immunoassays. Clin Chim Acta. 2009 Mar;401(1-2):175-6. doi: 10.1016/j.cca.2008.11.001. Epub 2008 Nov 8. PubMed PMID: 19028480.
19: Musa BU, Kumar RS, Dowling JT. Role of thyroxine-binding globulin in the early distribution of thyroxine and triiodothyronine. J Clin Endocrinol Metab. 1969 May;29(5):667-74. PubMed PMID: 4976514.
20: Kalra J, Hart IR. Value of free thyroxine (FT4), free triiodothyronine (FT3), and sensitive thyrotropin (TSH) assay in the assessment of optimal thyroxine therapy. Clin Biochem. 1987 Aug;20(4):265-7. PubMed PMID: 3690828.