| iFlash-FT4 | 06925912715429 | SHENZHEN YHLO BIOTECH CO., LTD. | Class B | |
| iFlash-FT4 | 06925912718567 | SHENZHEN YHLO BIOTECH CO., LTD. | Class B | |
| iFlash-FT4 | 06925912723134 | SHENZHEN YHLO BIOTECH CO., LTD. | Class B | |
| IMMULITE 2000 Free T4 | 00630414996844 | Siemens Healthcare Diagnostics Products Ltd. | Class B | |
| IMMULITE 2000 Free T4 | 00630414996851 | Siemens Healthcare Diagnostics Products Ltd. | Class B | |
| iStar-FT4 | 06973224892437 | Shenzhen Drawray Biotech Co., Ltd. | Class B | |
| Kemilo FT4 Kit | 06971225935405 | Goldsite Diagnostics Inc. | Unknown class | |
| LIAISON® FT4 | 08056771200295 | DiaSorin Italia S.p.A. | Unknown class | |
| MAGICL FT4 (CLIA) | 06954414798074 | Getein Biotech, Inc. | Unknown class | |
| NovaLisa® Free T4 | +ENTIFT4105007 | Gold Standard Diagnostics Frankfurt GmbH | Unknown class | |
| OCFD03-FT4-K | 03770024321401 | Cisbio Bioassays | Unknown class | |
| RapidFor™ | 08683548250223 | Vitrosens Biotechnology Inc. | Class B | |
| RapidFor™ | 08685115804204 | Vitrosens Biotechnology Inc. | Unknown class | |
| RIA-gnost FT4 | 03770024321388 | Cisbio Bioassays | Unknown class | |
| RIA-gnost FT4 | 03770024321395 | Cisbio Bioassays | Unknown class | |
| Sharay FT4 (CLIA) | 06975070762766 | C-Luminary Biotechnology Co., Ltd. | Unknown class | |
| SmarLumi | 06933289852524 | Guangzhou Wondfo Biotech Co., Ltd. | Unknown class | |
| SmarLumi | 06933289852531 | Guangzhou Wondfo Biotech Co., Ltd. | Unknown class | |
| SmarLumi | 06933289852548 | Guangzhou Wondfo Biotech Co., Ltd. | Unknown class | |
| SmarLumi | 06933289852555 | Guangzhou Wondfo Biotech Co., Ltd. | Unknown class | |
| ST AIA-PACK FT4 | 14560189210315 | Tosoh Corporation | Unknown class | |
| STANDARD™ i fT4 | 08800111723360 | SD Biosensor Inc. | Class B | |
| STANDARD™ i fT4 | 08800111723377 | SD Biosensor Inc. | Class B | |
| STANDARD™ i fT4 | 08800111723384 | SD Biosensor Inc. | Class B | |
| Tisenc Free Thyroxine (CLIA) | 06971824207477 | Shenzhen Tisenc Medical Devices Co., Ltd. | Unknown class | |
| Tisenc Free Thyroxine (CLIA) | 06971824207484 | Shenzhen Tisenc Medical Devices Co., Ltd. | Unknown class | |
| Tisenc Free Thyroxine (CLIA) | 06971824207491 | Shenzhen Tisenc Medical Devices Co., Ltd. | Unknown class | |
| Tisenc Free Thyroxine (CLIA) | 06971824207507 | Shenzhen Tisenc Medical Devices Co., Ltd. | Unknown class | |
| TruVue | 15065023763587 | BioFynder Limited | Unknown class | |
| TSH/FT3/FT4 (CLIA) | 06977290930420 | DROPHIL BIOTECH (SHENZHEN) COMPANY LIMITED | Class B | |
| VIDAS® FT4 | 03573026240400 | bioMérieux SA | Class B | |
| Wondfo Free Thyroxine (CLIA) | 06971824207514 | Shenzhen Tisenc Medical Devices Co., Ltd. | Unknown class | |
| Wondfo Free Thyroxine (CLIA) | 06971824207521 | Shenzhen Tisenc Medical Devices Co., Ltd. | Unknown class | |
| Wondfo Free Thyroxine (CLIA) | 06971824207538 | Shenzhen Tisenc Medical Devices Co., Ltd. | Unknown class | |
| Wondfo Free Thyroxine (CLIA) | 06971824207545 | Shenzhen Tisenc Medical Devices Co., Ltd. | Unknown class | |