You do not "read" a stethoscope. It is a device that allows medical personnel to hear sounds within the body. Areas of sounds you can hear with a stethoscope include: heart sounds arterial sounds, such as a bruit (an abnormal sound) breath sounds (lungs) bowel sounds
Adventitious sounds are sounds that you hear that are not normal sounds of inspiration and expiration. Examples are 1. rales, crackles and crepitations; 2. wheeze; 3. stridor; 4. pericardial friction rub; 5. rhonchi.
Oftentimes tuberculosis can be asymptomatic, and only show up on skin test or x-ray after exposure. When tuberculosis does become symptomatic, it can be accompanied by a productive cough, shortness of breath, and general malaise.