| Abbreviations | Meaning |
 | A | Acidity |
| QAAA | Quantitative Amino Acid Analysis |
| KA | Alkaline Phosphatase; Kainic Acid; Keratoacanthoma; Keto Acid; Ketoacidosis; King-Armstrong [unit]; Knowledge Acquisition; Knowledge Aggregate |
| DCHA | Docosahexaenoic Acid |
| ASP | Aspartic Acid; Asparaginase |
| PA | Periodic Acid |
| PNA | Paris Nomina Anatomica; Peanut Agglutinin; Pentose Nucleic Acid; P-nitroaniline |
| ANC | Acid Neutralization Capacity |
| TP-DNA | Template Deoxyribonucleic Acid [DNA] |
| MBLA | Methylbenzyl Linoleic Acid; Mouse-specific Bone-marrow-derived Lymphocyte Antigen |
| BA | Barbituric Acid |
| LASAF | Low Quantities Of Acetylsalicylic Acid In Atrial Fibrillation |
| LAT | L-type Amino Acid Transporter |
| AAS | Aarskog-Scott [syndrome]; Acid Aspiration Syndrome; Alcoholic Abstinence Syndrome; American Academy Of Sanitarians |
| DOTA | Tetraazacyclododecanetetraacetic Acid |
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