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Free T4

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Also known as: T4; Thyroxine
Formal name: Free Thyroxine

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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). T4 test. MedlinePlus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/003517.htm through http://www.nlm.nih.gov. Accessed June 2014.

(© 1995–2014). T4 (Thyroxine), Total Only, Serum. Mayo Clinic Mayo Medical Laboratories [On-line information]. Available online at http://www.mayomedicallaboratories.com/test-catalog/Overview/8724 through http://www.mayomedicallaboratories.com. Accessed June 2014.

Hammami, M. (Updated 2013 July 23). Thyroxine. Medscape Reference [On-line information]. Available online at http://emedicine.medscape.com/article/2089576-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 958-960.

McPherson, R. and Pincus, M. (© 2011). Henry's Clinical Diagnosis and Management by Laboratory Methods 22nd Edition: Elsevier Saunders, Philadelphia, PA. Pp 377-378.

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.

U.S. Preventive Services Task Force (2004 May 15). Screening for Thyroid Disease: Recommendation Statement. American Family Physician [On-line journal]. Available online at http://www.aafp.org/afp/20040515/us.html through http://www.aafp.org.

MedlinePlus Medical Encyclopedia. T4 (Updated 10/24/07). [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/003517.htm.

(© 2005). Thyroxine, Free (Free T4). ARUP's Guide to Clinical Laboratory Testing [On-line information]. Available online at http://www.aruplab.com/guides/clt/tests/clt_245b.jsp#1149312 through http://www.aruplab.com.

(© 2005). Thyroxine. ARUP's Guide to Clinical Laboratory Testing [On-line information]. Available online at http://www.aruplab.com/guides/clt/tests/clt_243b.jsp#1149270 through http://www.aruplab.com.

Wu, A. (2006). Tietz Clinical Guide to Laboratory Tests, Fourth Edition. Saunders Elsevier, St. Louis, Missouri. Pp. 1050-1053.

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

Eckman, A. (Updated 2010 April 20). T4 Test. MedlinePlus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/003517.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 958-960.

Lee, S. and Ananthakrishnan, S. (Updated 2010 April 26). Hyperthyroidism. eMedicine [On-line information]. Available online at http://emedicine.medscape.com/article/121865-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.

Irizarry, L. et. al. (Updated 2010 April 23). Toxicity, Thyroid Hormone. eMedicine [On-line information]. Available online at http://emedicine.medscape.com/article/819692-overview through http://emedicine.medscape.com. Accessed February 2011.