| FOB | fecal occult blood; feet out of bed; fiberoptic bronchoscopy; foot of bed; functional observational ... |
|---|---|
| FRFC | functional renal failure of cirrhosis |
| FRP | follicle-stimulating hormone releasing protein; functional refractory period |
| FRV | full-length retroviral [sequence]; functional residual volume |
| FSI | foam stability index; Food Sanitation Institute; functional status index; function status index |