| Abbreviations | Meaning |
 | FFAP | Free Fatty Acid Phase |
| ADU | Alkaline Deoxyribonucleic Acid Unwinding |
| AP | Acid Phosphatase |
| ACINH | Acid Labile Isonicotinic Acid Hydrazide |
| AMD | Acid Maltase Deficiency; Acromandibular Dysplasia; Actinomycin D; S-adenosylmethionine Decarboxylase; Adrenomyelodystrophy |
| AFB | Acid Fast Bacillus |
| IDNA | Intercalary Deoxyribonucleic Acid |
| LPA | Latex Particle Agglutination; Left Pulmonary Artery; Lipoprotein A; Lysophosphatidic Acid |
| UA/C | Uric Acid/creatinine [ratio] |
| ASM | Acid Sphingomyelinase |
| GLCA | Gluconic Acid |
| HEMPAS | Hereditary Erythrocytic Multinuclearity With Positive Acidified Serum |
| THF | Tetrahydrocortisone F; Tetrahydrofolate; Tetrahydrofolic [acid]; Tetrahydrofuran; Thymic Humoral Factor |
| AC | Acidified Complement; Acinetobacter Calcoaceticus; Acromioclavicular; Activated Charcoal; Acupuncture Clinic; Acute; Acute Cholecystitis |
| HBABA | Hydroxybenzeneazobenzoic Acid |
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