Lung Tissue Culture for Pathogenic Microorganism Identification (with Antimicrobial Susceptibility Testing)

Why This Test Is Done

Your doctor may order this test if you have symptoms like persistent cough, fever, chest pain, or difficulty breathing, especially if you’ve been exposed to infections like tuberculosis or pneumonia. It’s also used in patients with weakened immune systems or chronic lung conditions to find hidden infections.

What to Expect Before the Test

You’ll likely have a procedure called a **bronchoscopy** or **bronchoalveolar lavage** where a thin tube is inserted into your airways to collect lung fluid or tissue. You may feel discomfort but won’t need anesthesia unless the procedure is more invasive. Follow any fasting instructions if applicable.

What Happens During the Test

The collected sample is grown in a lab to grow any microbes present. After 2–3 days, the lab identifies the germs (if any) and tests their sensitivity to antibiotics. Results can take several days to weeks, depending on the complexity of the culture.

What the Results Mean

Positive results show the presence of microbes (e.g., *Staphylococcus*, *Mycobacterium tuberculosis*). The susceptibility report tells your doctor which antibiotics are most effective against those germs, helping avoid unnecessary strong medications.