Ultrafast / Electron Beam CT Scan
Underactive Adrenal Glands / Addison's Disease
Undescended Testes (Cryptorchidism)
Uniparental Disomy: Prader-Willi Syndrome, Angelman Syndrome
Upper Respiratory Infection (URI, or Common Cold)
Ureterocele and Ureteral Duplication
Urinary Incontinence (Enuresis)
Urinary Tract and Kidney Infections