What Is in Sputum

Contents. Sputum is made up from secretions from cells lining the respiratory tract, dead cells, foreign matter that is breathed into the lungs, such as tar from cigarettes and air pollutants, and white blood cells and other immune cells. In infections, bacteria may also be present in sputum.

What sputum contains?

Sputum contains cells from the immune system that help fight the bacteria, fungi, or other foreign substances in your lungs or airways. The thickness of sputum helps trap the foreign material. This allows cilia (tiny hairs) in the airways to push it through the mouth and be coughed out.

What do you observe in sputum?

Frothy (white or pink-tinged, foamy, thin sputum) is associated with pulmonary edema. Foul-smelling is typical of anaerobic infection. This is associated with bronchiectasis, lung abscess, or cystic fibrosis. If the sputum is discoloured, you should find out if it clears with coughing.