| RVEF | right ventricular ejection fraction; right ventricular end-flow |
|---|---|
| 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 |