Since a white area was seen on your chest x-ray, other tests may be indicated to tell what might be causing your sputum and shortness of
breathBreath alcohol test
Breath holding spell
Breath odor. A chest CT scan is more sensitive and shows more detail than a chest x-ray, so this is a more definite diagnostic tool. Another test that may be recommended is spirometry. This is a simple breathing test that checks to see how your lungs are working.