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What is this test?

A cystic fibrosis respiratory culture is a laboratory test that identifies specific bacteria growing in the lungs of people with cystic fibrosis (CF). CF causes thick, sticky mucus to build up in the lungs, which creates an environment where bacteria can easily grow and cause infections. This test helps doctors detect these infections early and choose the most effective treatment.

How is the sample collected?

The most common method is collecting a sputum sample, which is mucus that you cough up from your lungs. You will be asked to rinse your mouth with water first to avoid contamination, then cough deeply to bring up mucus from your airways. In some cases, a doctor may collect samples through a bronchoscopy, where a thin tube is passed through the nose or mouth into the lungs to collect fluid directly.

What happens in the laboratory?

The sample is sent to a laboratory where it is placed in special containers with nutrients that allow bacteria to grow. Technicians monitor the sample over several days to see which types of bacteria appear. If bacteria grow, additional tests are done to identify the exact species and determine which antibiotics will be most effective against them.

How often should this test be done?

For patients with cystic fibrosis, respiratory cultures are typically done at every clinic visit, which may be every 1-3 months. Regular testing is important because lung infections can develop quickly in CF patients, and early detection helps prevent serious complications and helps maintain lung function.