The following are useful signs of correct TT placement:

• A positive capnography trace
• A clear view of the TT passing between the vocal cords
• The rise and fall of the patient’s chest wall
• Bilateral air entry throughout both lung fields. This is important so as to exclude an endobronchial intubation which can occur if the TT is inserted too far
• Misting in the TT on expiration

Note: it is best to auscultate with your stethoscope in the axillae using manual ventilation.