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Pediatric ETT & LMA Sizing

Endotracheal tube size and depth (Cole) and LMA size by weight.

Cuffed ETT = age/4 + 3.5 · Uncuffed ETT = age/4 + 4 · Depth (cm) = age/2 + 12
Cuffed ETT
4.5mm ID
Uncuffed ETT
5mm ID
Depth at lip
14cm
LMA size
2
Cuff volume
≤10 mL

Have one size above and below available. Confirm with bilateral breath sounds, capnography, and assess for leak (cuffed: leak at 20–25 cmH₂O).

References & Further Reading

  1. 1
    Textbook

    Gropper MA, Miller RD, Cohen NH, et al., eds. Miller's Anesthesia. 9th ed. Philadelphia: Elsevier; 2020.

  2. 2
    Textbook

    Adriano A, Morris R, eds. 2021 CA-1 Tutorial Textbook (15th Ed.). Stanford University Medical Center, Department of Anesthesiology.

Citations are provided to direct further study. Always check the most current edition of guidelines and society recommendations — the information in this chapter is a teaching summary, not primary source material.