| ATM | abnormal tubular myelin; acute transverse myelopathy; asynchronous transfer mode; atmosphere |
|---|---|
| atm | standard atmosphere |
| 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 |