Pediatric Anesthesiology

Laryngeal Mask Airway (LMA) and Sizes and
Fiberscope and ETT sizes for LMA-fiberoptic Intubation


LMA size Patient weight (kg) Internal diameter (mm) Cuff volume (ml) ETT's (ID, mm) sizes recommended Fiberscope size (mm)
1 < 6.5 5.25 2-5 3.0, 3.5 2.2, 2.7
1.5 5-10 6.1 2-8 3.5, 4.0 2.2, 2.7
2 10-20 7.0 2-10 4.0, 4.5 2.2, 2.7, 3.7
2.5 20-30 8.4 2-15 5.0 3.7, 4.0*
3 >30 10 10-25 6.0 4.0
4 >70 10-12 20-30 6.0, 6.5 4.0
5 >80 11.5 20-40 7.0 4.0

* May need to remove ETT connector

Table adapted from
Pennant JH, White PF: Anesthesiology 79:144, 1993,
Bahk J-H, Choi I-H: Paediatric Anaesthesia 9:96, 1999, and
Johr M, Berger TM: Pediatric Anesthesia 14:614, 2004



Greg Gordon MD
Updated: