The Body Fluid Analysis Pleural Fluid Test is an essential diagnostic evaluation used to investigate the underlying causes of fluid accumulation within the pleural space surrounding the lungs. A sample, obtained via thoracentesis, undergoes comprehensive laboratory testing, including cell counts, protein and glucose measurements, pH levels, and microbiological cultures. This detailed analysis helps clinicians differentiate between transudative effusions, often caused by heart failure or systemic conditions, and exudative effusions resulting from infections, inflammation, or malignancy. By accurately characterizing the pleural fluid composition, this test guides targeted therapeutic interventions and clinical management strategies.