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Table 3 Sizing polyvinyl chloride double-lumen tubes [63]

From: Clinical review: Independent lung ventilation in critical care

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