| K240273 | Access Free T4 | Beckman Coulter, Inc. | 2024-03-06 |
| K182423 | MAGLUMI 2000 FT4 | Shenzhen New Industries Biomedical Engineering Co., Ltd. | 2018-10-04 |
| K181233 | Elecsys FT4 III | Roche Diagnostics | 2018-09-18 |
| K173122 | Abbott Architect Free T4 | Abbott Laboratories | 2017-10-27 |
| K152422 | FREND™ Free T4 Test System | Nanoentek USA, Inc. | 2016-02-17 |
| K132058 | VIDAS FT4 | Biomerieux S.A. | 2015-06-08 |
| K140842 | DIMENSION LOCI FREE THYROXINE FLEX REAGENT CARTRIDGE, FT4L, DIMENSION LOCI THYROID STIMULATING HORMONE FLEX REAGENT CART | Siemens Healthcare Diagnostics, Inc. | 2014-11-26 |
| K140859 | DIMENSION VISTA FREE THYROXINE FLEX REAGENT CARTRIDGE, FT4, DIMENSION VISTA THYROID STIMULATING HORMONE FLEX REAGENT | Siemens Healthcare Diagnostics, Inc. | 2014-11-26 |
| K131244 | ELECSYS FT4 II ASSAY, ELECSYS FT4 II CALSET | Roche Diagnostics | 2014-01-27 |
| K132249 | ADVIA CENTAUR FT4, ADVIA CENTAUR T4 | Siemens Healthcare Diagnostics, Inc. | 2013-09-13 |
| K121951 | LIAISON FT4 LIAISON CONTROL THYROID 1 LIAISON CONTROL THYROID 2 LIAISON CONTROL THYROID 3 | DiaSorin, Inc. | 2013-04-04 |
| K123379 | ABBOTT ARCHITECT FREE T4 | Abbott Laboratories | 2012-11-27 |
| K083373 | IMMULITE 2000 FREE T4 | Siemens Healthcare Diagnostics, Inc. | 2009-02-02 |
| K080167 | ACS 180 AND ADVIA CENTAUR FT4 IMMUNOASSAYS | Siemens Healthcare Diagnostics | 2008-08-08 |
| K073604 | DIMENSION EXL WITH LM CLINICAL CHEMISTRY SYSTEM, DIMENSION FT4L FLEX REAGENT CARTRIDGE, AND LOCI THYROID CALIBRATOR, MOD | Dade Behring, Inc. | 2008-03-13 |