| PPF | pellagra preventive factor; phagocytosis promoting factor; phosphonoformate; plasma protein fraction... |
|---|---|
| PRF | partial reinforcement; patient report form; perforin; plasma recognition factor; pontine reticular f... |
| PSF | peak scatter factor; peptide supply factor; point spread function; pseudosarcomatous fasciitis |
| RIF | radiological interface; release-inhibiting factor; rifampin; right iliac fossa; rosette-inhibiting f... |
| SBF | serologic-blocking factor; specific blocking factor; splanchnic blood flow |