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Free T3 and Total T3

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Also known as: FT3; Triiodothyronine
Formal name: Free Triiodothyronine; Total Triiodothyronine

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NOTE: This article is based on research that utilizes the sources cited here as well as the collective experience of the Lab Tests Online Editorial Review Board. This article is periodically reviewed by the Editorial Board and may be updated as a result of the review. Any new sources cited will be added to the list and distinguished from the original sources used.

Sources Used in Current Review

(Updated 2014 May 14). Thyroid Tests. National Endocrine and Metabolic Diseases Information Service [On-line information]. Available online at http://endocrine.niddk.nih.gov/pubs/thyroidtests/index.aspx through http://endocrine.niddk.nih.gov. Accessed June 2014.

Topiwala, S. (Updated 2012 June 26). T3 test. MedlinePlus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/003687.htm through http://www.nlm.nih.gov. Accessed June 2014.

(© 1995–2014). T3 (Triiodothyronine), Total, Serum. Mayo Clinic Mayo Medical Laboratories [On-line information]. Available online at http://www.mayomedicallaboratories.com/test-catalog/Overview/8613 through http://www.mayomedicallaboratories.com. Accessed June 2014.

Poduval, J. (Updated 2014 January 17). Triiodothyronine. Medscape Reference [On-line information]. Available online at http://emedicine.medscape.com/article/2089598-overview through http://emedicine.medscape.com. Accessed June 2014.

Meikle, A. W. and Straseski, J. (Updated 2014 April). Thyroid Disease. ARUP Consult [On-line information]. Available online at http://www.arupconsult.com/Topics/ThyroidDz.html?client_ID=LTD through http://www.arupconsult.com. Accessed June 2014.

Pagana, K. D. & Pagana, T. J. (© 2011). Mosby's Diagnostic and Laboratory Test Reference 10th Edition: Mosby, Inc., Saint Louis, MO. Pp 967-968.

McPherson, R. and Pincus, M. (© 2011). Henry's Clinical Diagnosis and Management by Laboratory Methods 22nd Edition: Elsevier Saunders, Philadelphia, PA. Pg 378.

Sources Used in Previous Reviews

Thomas, Clayton L., Editor (1997). Taber's Cyclopedic Medical Dictionary. F.A. Davis Company, Philadelphia, PA [18th Edition].

Pagana, Kathleen D. & Pagana, Timothy J. (2001). Mosby's Diagnostic and Laboratory Test Reference 5th Edition: Mosby, Inc., Saint Louis, MO.

Brown, T. (2004 January 27, Updated). T3. MedlinePlus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/003687.htm.

(© 2005). Triiodothyronine. ARUP's Guide to Clinical Laboratory Testing [On-line information]. Available online at http://www.aruplab.com/guides/clt/tests/clt_259c.jsp#1149556 through http://www.aruplab.com.

Wu, A. (2006). Tietz Clinical Guide to Laboratory Tests, Fourth Edition. Saunders Elsevier, St. Louis, Missouri. Pp. 1076-1081.

ARUP's Laboratory Test Directory: T3 Uptake. Available online at http://www.aruplab.com/guides/ug/tests/0070135.jsp through http://www.aruplab.com.

Amarillo Medical Specialists. How to interpret your blood test results. Available online at http://www.amarillomed.com/howto.htm through http://www.amarillomed.com.

MedlinePlus Medical Encyclopedia. T3RU test (Updated 10/24/07). Available online at http://www.nlm.nih.gov/medlineplus/ency/article/003688.htm.

Shomon, Mary. Thyroid Blood Tests. About.com Guide. Updated March 27, 2007. Available online at http://thyroid.about.com/od/gettestedanddiagnosed/a/bloodtests.htm through http://thyroid.about.com. Accessed June 22, 2010.

Tietz Textbook of Clinical Chemistry and Molecular Diagnostics. Burtis CA, Ashwood ER, Bruns DE, eds. St. Louis: Elsevier Saunders; 2006, Pp. 2053, 2063-2064.

Kasper DL, Braunwald E, Fauci AS, Hauser SL, Longo DL, Jameson JL eds (2005). Harrison's Principles of Internal Medicine, 16th Edition, McGraw Hill, Pg 2119.

Eckman, A. (Updated 2010 April 20). T3 Test. MedlinePlus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/003687.htm. Accessed February 2011.

Pagana, K. D. & Pagana, T. J. (© 2011). Mosby's Diagnostic and Laboratory Test Reference 10th Edition: Mosby, Inc., Saint Louis, MO. Pp 976-977.

Aytug, S. and Shapiro, L. (Updated 2010 April 5). Euthyroid Sick Syndrome. eMedicine [On-line information]. Available online at http://emedicine.medscape.com/article/118651-overview through http://emedicine.medscape.com. Accessed February 2011.

(© 2008). Thyroid Function Tests. American Thyroid Association [On-line information]. Available online at http://www.thyroid.org/patients/patient_brochures/function_tests.html through http://www.thyroid.org. Accessed February 2011.

Kansagra, S. et. al. (2010 June 10). The Challenges and Complexities of Thyroid Hormone Replacement. Medscape Today from Laboratory Medicine. 2010;41(6):229-348 [On-line information]. Available online at http://www.medscape.com/viewarticle/722086 through http://www.medscape.com. Accessed February 2011.