Sputum Cytology

Test Overview

Sputum cytology examines a sample of sputum (mucus) under a microscope to determine whether abnormal cells are present. Sputum is not the same as saliva. Sputum is produced in the lungs and in the airways leading to the lungs. Sputum has some normal lung cells in it. See a picture of the lungs' airways .

Sputum cytology may be done to help detect certain noncancerous lung conditions. It may also be done when lung cancer is suspected.

A sputum sample may be collected:

• By a person coughing up mucus.
• By breathing in a saltwater (saline) mist and then coughing.
• During bronchoscopy, which uses a bronchoscope to look at the throat and airway.

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Author:	Monica Rhodes	Last Updated: March 10, 2009
Medical Review:	Caroline S. Rhoads, MD - Internal Medicine R. Steven Tharratt, MD, MPVM, FACP, FCCP - Pulmonology, Critical Care, Medical Toxicology
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