Sputum cytology offers non-invasive diagnostic insights for lung health

Sputum cytology, also known as sputum analysis, is a non-invasive, painless, and inexpensive diagnostic method used to gain insight into respiratory health. By analyzing cells that have naturally exfoliated from the surface of organs and reached the sputum, doctors can examine the contents of the lungs under a microscope.

While primarily used for oncological diagnostics to detect lung cancer, this method can also identify causes of chronic or acute inflammation and assist in diagnosing allergic conditions, such as asthma, by detecting elevated levels of specific inflammatory cells like eosinophils.

Medical professionals typically recommend this test when symptoms suggest problems in the lower respiratory tract. Key indicators for this analysis include a persistent, long-term cough—particularly in long-term smokers—and hemoptysis, which is the coughing up of blood. It is also frequently used as a follow-up diagnostic step when X-rays show suspicious or unclear findings, even in patients without obvious symptoms.