| Abbreviations | Meaning |
 | PCA | Phenylcarboxylic Acid |
| AH | Abdominal Hysterectomy; Absorptive Hypercalciuria; Accidental Hypothermia; Acetohexamide; Acid Hydrolysis; Acute Hepatitis; Adrenal Hypoplasia |
| HPAH | Hydralazine Pyruvic Acid Hydrazone |
| FAS | Fatty Acid Synthetase |
| BAIB | Beta-aminoisobutyric [acid] |
| CCCDNA | Covalently Closed Circular Deoxyribonucleic Acid |
| HIDA | Health Industry Distributors Association; Hepato-iminodiacetic Acid (lidofenin) [nuclear Medicine Scan] |
| FGF1 | Fibroblast Growth Factor 1 [acidic] |
| APM | Acid Precipitable Material |
| PTA | Phosphotungstic Acid |
| ABC | Abacavir; Absolute Basophil Count; Absolute Bone Conduction; Acalculous Biliary Colic; Acid Balance Control; Aconite-belladonna-chloroform |
| GSA | Guanidinosuccinic Acid |
| PKA | Negative Logarithm Of The Acid Ionization Constant |
| PA | Periodic Acid |
| 3-GPA | 3-guanidinopropionic Acid |
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