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Comparative sizing of single-lumen, Univent and double-lumen tubes [12]
| Single-lumen endotracheal tubes (internal diameter in mm) | Univent tubes (internal diameter in mm) | Double-lumen tube (F) |
| 12.5 | 9.0 | 41 |
| 12.0 | 8.5 | 39 |
| 11.0 | 8.0 | 37 |
| 9.5 | 7.5 | 35 |
| 9.0 | 7.0 | 33 |
| 8.0 | 6.0 | 28 |
