What should be the internal diameter of the endotracheal tube in a child weighing 1500 gm ?: (A) 2 mm, (B) 2.5 mm, (C) 3 mm, (D) 3.5 mm
Answer is C. Body weight in grams and internal diameter of ET tube :-
< 1000 gm = 2.5 mm, 1000-2000 gm = 3 mm, 2000-3000 = 3.5 mm, > 3000 = 3.5-4.0 mm.