Good to knowOne result rarely tells the whole story. Your provider looks at your results together with your symptoms, exam, and other tests.
What the test is
The sample must come from deep in the lungs, not saliva.
Why it's done
- Pneumonia not improving
- Possible TB
- Lung conditions like bronchiectasis or cystic fibrosis
Getting ready and what happens
- Collect first thing in the morning after rinsing your mouth with water.
How the test is done
- You take deep breaths and cough mucus into a sterile cup.
What the results mean
Positive
Names the germ and guides antibiotics.
Questions to ask your provider
- What do my results mean for me?
- Do I need to repeat this test or have other tests?
Related conditions
Related tests
Sources
Last updated 2026-11-13.