| LDUB | long double upright brace |
|---|---|
| SDUB | short double upright brace |
| UMA | ulcerative mutilating acropathy; upright membrane assay; urinary muramidase activity |
| UP | parallax unsharpness; ulcerative proctitis; ultrahigh purity; unipolar; upright posture; ureteropelv... |
| UPPRA | upright peripheral plasma renin activity |