Spirometry is usually adequate for preoperative risk assessment and stratification. It is also often adequate for rotated obstructive lung disease, such as emphysema or asthma. However, when a patient's symptoms or clinical history cannot be explained by findings on spirometry or when multiple coexisting processes (e.g., dyspnea with both heart and lung disease) are present, then further testing is usually warranted.
Phlegm is a mucus-like substance produced by the lower airways, such as the lungs and the respiratory system leading to the lungs, not by the nose and sinuses, which produce the mucus that streams out of or clogs up your nose. You may not notice phlegm unless you cough it up as a symptom of bronchitis or pneumonia.As is the case with mucus, phlegm that has a color such as green or yellow may indicate infection. Any time you see blood in the phlegm you cough up, you should seek medical attention. 3.ou may not notice phlegm unless you cough it up as a symptom of bronchitis or pneumonia. As is the case with mucus, phlegm that has a color such as green or yellow may indicate infection. Any time you see blood in the phlegm you cough up, you should seek medical attention.
1 Treat nasal and sinus infections as soon as they occur as these often lead to chest infections and can cause excessive phlegm. 2  Do not take pharmaceutical cough suppressants as these cause phlegm to build up in the lungs and can lead to prolonged infection.  Go to a physiotherapist.