AFB Stain, Pleural Fluid

Description

This test is designed to detect the presence of acid-fast bacilli (AFB) in pleural fluid, which is found in the space surrounding the lungs. It’s primarily used to diagnose tuberculous pleuritis, a form of extrapulmonary tuberculosis affecting the pleura. The test involves staining the pleural fluid sample and examining it under a microscope for the presence of acid-fast bacilli. While a positive result can indicate the presence of mycobacteria, including Mycobacterium tuberculosis, a negative result doesn’t rule out infection. This test is often used in conjunction with culture tests, ADA levels, and molecular methods for a comprehensive diagnosis of tuberculous pleuritis, especially in regions with high tuberculosis prevalence.