| 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] |