| SPF | skin protection factor; specific-pathogen free; spectrophotofluorometer; S-phase fraction; split pro... |
|---|---|
| SUN | standard unit of nomenclature; serum urea nitrogen |
| ABCDE | airway, breathing, circulation, disability, exposure [in trauma patients]; botulism toxin pentavalen... |
| ALARA | as low as reasonably achievable [radiation exposure] |
| BEI | back-scattered electron imaging; biological exposure indexes; butanol-extractable iodine |