| SF | Sabin-Feldman [test]; safety factor; salt-free; scarlet fever; screen film; seminal fluid; serosal f... |
|---|---|
| AEF | allogenic effect factor; amyloid enhancing factor; aorto-enteric fistula |
| EC | effective concentration; ejection click; electrochemical; electron capture; embryonal carcinoma; eme... |
| E/C | endocystoscopy; enteric-coated; estrogen/creatinine ratio |
| ECAO | enteric cytopathogenic avian orphan [virus] |