| USAN | United States Adopted Names |
|---|---|
| USASI | United States of America Standards Institute |
| USB | upper sternal border |
| USBS | United States Bureau of Standards |
| USCG | ultrasonic cardiography |
| USD | United States Dispensary |
| USDA | United States Department of Agriculture |
| USDHEW | United States Department of Health, Education, and Welfare |
| USDHHS | United States Department of Health and Human Services |
| USE | ultrasonic echography; ultrasonography |