| UGIH | upper gastrointestinal hemorrhage |
|---|---|
| UH | umbilical hernia; uncontrolled hemorrhage; unfavorable histology; upper half |
| NREM | Non-Rapid Eye Movement |
| OD | 1) Doctor of Optometry 2) Oculus Dexter; Right Eye; 우측눈 3)... |
| OS | 1) Opening Snap 2) Orthopedic(Osteo)-Surgery; 정형 외과 3) Ocu... |