| FT4 | Free T4 |
|---|---|
| FT4 | free thyroxine |
| FT4I | Free T4 Index = T3RU x T4 |
| FT4I | free thyroxine index |
| FTA | fluorescent titer antibody; fluorescent treponemal antibody |
| FTA-ABS test | Fluorescent Treponemal Antibody ABSorption test |
| FTA-ABS, | FTA-Abs fluorescent treponemal antibody, absorbed [test] |
| FTAG, F-TAG | fast-binding target-attaching globulin |
| FTAS | familial testicular agenesis syndrome |
| FTAT | fluorescent treponemal antibody test |