| UN | ulnar nerve; undernourished; unilateral neglect; urea nitrogen; urinary nitrogen |
|---|---|
| USN | ultrasonic nebulizer; unilateral spatial neglect |
| CA/N | child abuse and neglect |
| SCAN | suspected child abuse and neglect; systolic coronary artery narrowing |
| USO | Unilateral Salping-Oophorectomy |