| anti-HBs | antibody to hepatitis B surface antigen |
|---|---|
| APC | acetylsalicylic acid, phenacetin, and caffeine; activated protein C; adenoidal-pharyngeal-conjunctiv... |
| APS | adenosine phosphosulfate; American Pain Society; American Pediatric Society; American Physiological ... |
| ARAM | antigen recognition activation motif |
| ARC | accelerating rate calorimetry; acquired immunodeficiency syndrome-related complex; active renin conc... |