| AASH | adrenal androgen stimulating hormone; American Association for the Study of Headache |
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| ACCESS | Ambulatory Care Clinic Effectiveness Systems Study; automated cervical cell screening system |
| APSS | Association for the Psychophysiological Study of Sleep |
| ASHI | Association for the Study of Human Infertility |
| ASIF | Association for Study of Internal Fixation |
| longitudinal study | <epidemiology> A study taking place over time. If individuals are followed, this is a longitudinal cohort study. If individuals are not followed, but classes (usually age classes) are restudied, this is a longitudinal cross-sectional study. The converse of a horizontal study. (05 Dec 1998) |
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