| Label | Id | |
|---|---|---|
| -1 (qualifier value) | CONC | |
| <3 (qualifier value) | CONC | |
| Amount of Substance Unit | CONC | |
| Unit of Amount of Substance | CONC | |
| Unit of Amount of Substance | CONC | |
| BU | CONC | |
| Bethesda Unit | CONC | |
| BU | CONC | |
| [beth'U] | CONC | |
| Bethesda Unit | CONC | |
| [BETH'U] | CONC | |
| Bethesda units | CONC | |
| Bethesda unit | CONC | |
| Milliequivalent | CONC | |
| milliequivalent (meq) | CONC |