| Abbreviations | Meaning |
 | FRA(X) | Chromosome X Fragility; Fragile X Chromosome, Fragile X Syndrome |
| PEAS | Patient Education And Activation System; Possible Estuary-associated Syndrome |
| AHU | Acute Hemolytic Uremic [syndrome]; Air Handling Unit; Arginine, Hypoxanthine, And Uracil |
| US2 | Usher Syndrome Type II |
| HRS | Hamman-Rich Syndrome |
| SRUS | Solitary Rectal Ulcer Syndrome |
| OPC | Oculopalatocerebral [syndrome]; Oligonucleotide Purification Cartridge; Outpatient Clinic; Overall Performance Category |
| TRAP | Carpal Tunnel Syndrome, Raynaud Phenomenon, Aching Muscles, Proximal Muscle Weakness [rheumatic Disorders Associated With Hypothyroidism] |
| RS | Reye Syndrome |
| HPS | Hermansky-Pudlak Syndrome |
| AMS | Aseptic Meningitis Syndrome |
| UCS | Uterine Compression Syndrome |
| ALTS | Acute Lumbar Trauma Syndrome |
| BWS | Battered Woman (or Wife) Syndrome; Beckwith-Wiedemann Syndrome |
| POSSUM | Pictures Of Standard Syndromes And Undiagnosed Malformations; Physiological And Operative Severity Score For The Enumeration Of Morbidity And Mortality [study] |
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