ENT Diagnostic and operative ENT e218dd97 Tracheostomy done at which level A T1 B T3 C T4 D T5 High-Yield Explanation A 2-3 cm veical or horizontal skin incision is made midway between the sternal notch and thyroid cailage . It&;s a Open surgical technique. Ref- Dhingra 6th edition, page 317.