Bronchoalveolar Lavage (BAL)

Bronchoalveolar lavage is a procedure in which a thin, flexible scope (bronchoscope) is passed into a small airway of the lung, and sterile saline is instilled and then suctioned back out. The recovered fluid contains cells, proteins, and any particles (including asbestos fibers and asbestos bodies) from the deep air spaces, which can then be examined in a laboratory.

Origin

"Bronchoalveolar" combines the Greek bronchos (windpipe) with the Latin alveolus (small cavity), referring to the smallest airways and air sacs of the lung. "Lavage" comes from the French laver, meaning to wash. The technique was developed in the 1970s alongside the flexible fiberoptic bronchoscope and became a standard pulmonary diagnostic tool in the 1980s.

Significance in Asbestos Context

For people with suspected asbestos-related disease, BAL can provide direct evidence that asbestos reached the deep lung. Pathologists count asbestos bodies (ferruginous bodies) per milliliter of recovered fluid; elevated counts support a meaningful occupational or environmental exposure and can help distinguish asbestosis from other causes of lung scarring. BAL is also used to rule out infection, sarcoidosis, hypersensitivity pneumonitis, and other mimics before a diagnosis of asbestosis or asbestos-related pulmonary fibrosis is finalized, and the recovered fluid may be referenced by experts in a legal claim as objective evidence of fiber exposure.

Example Sentence

After her CT scan showed bilateral lung scarring, the pulmonologist performed a bronchoalveolar lavage and found asbestos bodies in the fluid, which helped confirm her asbestosis diagnosis.

Related Terms

Asbestos Bodies, Ferruginous Bodies, Asbestosis, Fiber Burden Analysis, Bronchoscopy, Lung Biopsy

Notes

• Ask whether the lavage fluid will be examined specifically for asbestos bodies and whether a quantitative count (bodies per mL) will be reported. This number can be important evidence.
• Request that the pathology report, cell differential, and any fiber or asbestos body counts be added to your medical records and preserved; these documents can be critical to a future claim.
• A negative BAL does not rule out asbestos exposure or disease. Chrysotile fibers in particular are cleared more rapidly and may not show up, so ask your doctor whether additional testing (such as lung tissue digestion analysis) is warranted.
• BAL is usually done under conscious sedation as an outpatient procedure; tell your team about blood thinners, oxygen needs, and any prior bronchoscopy reactions before the procedure.