| SF | Sabin-Feldman [test]; safety factor; salt-free; scarlet fever; screen film; seminal fluid; serosal f... |
|---|---|
| SPF | skin protection factor; specific-pathogen free; spectrophotofluorometer; S-phase fraction; split pro... |
| TNF | true negative fraction; tumor necrosis factor |
| TPF | thymus permeability factor; thymus to peak flow; true positive fraction |
| TRF | T-cell replacing factor; thyrotropin-releasing factor; tubular rejection fraction |