Table 3. The main classes of respiratory sounds and the subclasses that are part of them.

Main class	subclasses included in the main class
normal lung sound	vesicular breath sound diminished breath sound louder breath sound normal bronchial sound
abnormal bronchial sound	no subclasses
crackles	fine crackles medium crackles coarse crackles crepitus
wheezes	inspiratory wheezes expiratory wheezes stridor
rhonchi	no subclasses