| NAF | nafcillin; National Amputation Foundation; National Ataxia Foundation; net acid flux |
|---|---|
| NOF | National Osteopathic Foundation; National Osteoporosis Foundation |
| AF | abnormal frequency; acid-fast; adult female; afebrile; aflatoxin; albumin-free; albumose-free; aldeh... |
| AFAR | American Foundation for Aging Research |
| AHRF | acute hypoxemic respiratory failure; American Hearing Research Foundation |