Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Tracheobronchomalacia ?
    ### Response:
    How is tracheobronchomalacia diagnosed? A diagnosis of tracheobronchomalacia (TBM) may be suspected based on the presence of characteristic signs and symptoms or abnormal pulmonary function tests. Additional testing such as CT scan and bronchoscopy can then be performed to confirm the diagnosis and evaluate the severity of the condition.
    