Associate of Applied Science 
Associate in Applied Science 
African Academy of Sciences 
American Association of Suicidology 
Association for Academic Surgery 
atomic absorption spectrometer 
atomic absorption spectrophotometry 
Australian Academy of Science 
Australian Association of Surgeons 
aarskog scott syndrome 
Aarskog-Scott 
abdominal aortic surgery 
absorbance spectrometry 
Abuse Assessment Screen 
acid aspiration syndrome 
acute abdominal series 
Addiction Acknowledgement Scale 
adrenal androgens 
Aeromonas salmonicida 
afferent arterioles 
African-Americans 
AIDS Attitude Scale 
alcohol abstinence syndrome 
alcoholic abstinence syndrome 
alkylating agents 
allergic Aspergillus sinusitis 
American Academy of Sanitarians 
American Analgesia Society 
Americans 
amino acid sequences