What does FT4 stand for?

MLA style: "FT4." Acronym Finder . 2012. AcronymFinder.com 11 Feb. 2012 http://www.acronymfinder.com/Free-Thyroxin-Index-(FT4).html
Chicago style: Acronym Finder . S.v. "FT4." Retrieved February 11 2012 from http://www.acronymfinder.com/Free-Thyroxin-Index-(FT4).html
APA style: FT4. (n.d.) Acronym Finder. (2012). Retrieved February 11 2012 from http://www.acronymfinder.com/Free-Thyroxin-Index-(FT4).html

Free Thyroxin Index

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Feet Per Second Fire Control Technician First Class (Naval Rating) Fractional T-1 Carrier FastTrak 100 (Promise Technology, Inc.) Fast Tracker 2 (digital music) Fire Control Technician Second Class (Naval Rating) Fire Control Technician Third Class (Naval Rating) Free Triiodothyronine Cubic Feet per Second Fraction of Thyroxine		Free Thyroxine Fraction Free-Thyroxin Concentration Free T4 (Thyroxine) by Equilibrium Dialysis Free plasma thyroxine index Feed the Five Thousand Face Threatening Act (politeness theory) Facility TEMPEST Assessment Failed to Arrive (shipping) Failure to Acquire (biometrics) Failure to Adapt