Bronchial washing is part of a procedure called a bronchoscopy, in which a physician looks into the lungs with a fiber-optic bronchoscope to check for irregularities and take tissue samples. The physician injects saline through the bronchoscope into the lung and then suctions it back out. By checking the wash return fluid, the doctor can diagnose bleeding, pneumonia, industrial pollutants, fungal infections and different kinds of lung cancer. Patients undergoing bronchial washing usually receive topical anesthesia with sedation. Most side effects of bronchial washing are mild and include coughing, sore throat and a sleepy feeling from being sedated.

One hundred and seventy-six cases of the 373 cases of bronchial cytology received were included for the study. Bronchial wash cytology technique showed high specificity. Cytohistopathology correlation showed 62.06% concordance rate. Cells from normal epithelium, reactive atypia, neoplastic atypia, squamous metaplasia, non-small cell and small cell carcinoma showed a mean nuclear diameter of 7.4 μm, 11.7 μm, 13.9 μm, 13.0 μm, 10.7 μm, and 17.7 μm, respectively, which was statistically significant with P < 0.05. Multiple comparisons between various groups using analysis of variance and Bonferroni tests also showed remarkable statistical significance.