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Sizing polyvinyl chloride double-lumen tubes [63]
| Tube size (F) | Circumference (mm) | Lumen diameter (mm) | Indication |
| 35 | 38.0 | 5.0 | Pediatrics |
| 37 | 40.0 | 5.5 | Small adults |
| 39 | 44.0 | 6.0 | Medium adults, usual female size |
| 41 | 45.0 | 6.5 | Large adults, usual male size |
