| Abbreviations | Meaning |
 | OAA | Old Age Assistance; Older Americans Act; Opticians Association Of America; Oxaloacetic Acid |
| TICA | Traumatic Intracranial Aneurysm; Trichloroacetic Acid |
| LA | Lactic Acidemia |
| NAF | Nafcillin; National Amputation Foundation; National Ataxia Foundation; Net Acid Flux; Neural Adaptive Filter |
| KA | Alkaline Phosphatase; Kainic Acid; Keratoacanthoma; Keto Acid; Ketoacidosis; King-Armstrong [unit]; Knowledge Acquisition; Knowledge Aggregate |
| PTAH | Phosphotungstic Acid Hematoxylin |
| LCP | Legg-Calve-Perthes [syndrome]; Long-chain Polysaturated [fatty Acid]; Lymphocyte Cytosol Polypeptide |
| AT | Acidity, Total; Angiotensin; Antithrombin; Astatine; Atrium, Atrial |
| DPA | Dipropylacetic Acid |
| PRE-MRNA | Precursor Messenger Ribonucleic Acid |
| DBP | Deoxyribonucleic Acid-binding Peptide |
| VGAT | Vesicular Gamma Aminobutyric Acid Transporter |
| AKA | Above-knee Amputation; Alcoholic Ketoacidosis; Also Known As; Antikeratin Antibody |
| HA | Hippuric Acid |
| TFA | Thigh-foot Angle; Tibio-femoral Angle; Total Fatty Acids; Transfatty Acid; Transverse Fascicular Area; Trifluoroacetic Acid |
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