| Table 3-1 | Normal Breath Sounds |
| Type, Description, and Location | Ratio of Inspiration to Expiration |
|---|
| Bronchial or Tubular |
| Blowing, hollow sounds; auscultated over the larynx and trachea | Sound on expiration is longer, lower, and higher-pitched than inspiration |
| Bronchovesicular |
| Medium-pitched, medium intensity, blowing sounds; auscultated over the first and second intercostal spaces anteriorly and the scapula posteriorly | Inspiration and expiration sounds have similar pitch and duration |
| Vesicular |
| Soft, low-pitched, whispering sounds; heard over most of the lung fields | Sound on inspiration is longer, louder, and higher-pitched than expiration |