A method and apparatus for determining the optimal endotracheal tube size for the intubation of a patient based upon both optimal tube length and optimal tube diameter which are determined by using either direct or indirect measurement devices or techniques to measure the patients glottis aperture and tracheal length. The apparatus may include a maneuverable arm, a fiber optic video guidance system and an introducer guide to maneuver an end of the apparatus around obstructions in a patient who has a difficult airway to facilitate insertion of either an optimally sized endotracheal tube or a standard endotracheal tube into the patients airway.
