Inner diameter of adult male endotracheal tube is:

Ans: c (9 mm) Ref: Ajay Yadav, 2nd ed, p. 33)Sizes of endotracheal tubesNormal healthy males usually need No: 9 (means inner diameter 9 mm)Normal healthy female -No: 8 (means inner diameter 8 mm)In childrenPremature: 2.5 mm i.d (Inner diameter)0-6 months: 3-3.5 mm i.d6 months to 1 year: 3.5-4 mm i.dFor children aged 1 -6 years is calculated by formulaAge (in years)+3.5 mm i.d3 For children aged > 6 yearsAge (in years)- 4.5 mm i.d4 Smallest size of tube available is 2.5 mm and largest size is 10.5 mm