Which statement about pleural effusion management is true?

Which statement about pleural effusion management is true?

• A. Thoracentesis is diagnostic and therapeutic
• B. It should always remove more than 1.5 L
• C. It has no diagnostic value
• D. It worsens effusion in all cases

Answer: (A)

The main idea here is that draining pleural fluid with thoracentesis serves both to diagnose the underlying cause and to relieve symptoms. Analyzing the pleural fluid lets you distinguish transudates from exudates and identify infections, cancers, or inflammatory processes through tests like protein and LDH (Light’s criteria), pH, glucose, Gram stain, culture, and cytology. At the same time, removing fluid provides immediate symptomatic relief by decreasing pleural pressure and improving lung expansion, which is especially helpful in large effusions or when the patient is short of breath. Because removing too much fluid at once can risk re-expansion pulmonary edema, the amount drained is tailored to the patient, commonly in smaller aliquots with reassessment rather than draining a fixed large volume. So thoracentesis being both diagnostic and therapeutic makes it the true statement. The other choices are not correct because the procedure does have diagnostic value, draining more than a standard safe amount at once is not mandatory, and it does not worsen effusion in all cases.

The main idea here is that draining pleural fluid with thoracentesis serves both to diagnose the underlying cause and to relieve symptoms. Analyzing the pleural fluid lets you distinguish transudates from exudates and identify infections, cancers, or inflammatory processes through tests like protein and LDH (Light’s criteria), pH, glucose, Gram stain, culture, and cytology. At the same time, removing fluid provides immediate symptomatic relief by decreasing pleural pressure and improving lung expansion, which is especially helpful in large effusions or when the patient is short of breath. Because removing too much fluid at once can risk re-expansion pulmonary edema, the amount drained is tailored to the patient, commonly in smaller aliquots with reassessment rather than draining a fixed large volume. So thoracentesis being both diagnostic and therapeutic makes it the true statement. The other choices are not correct because the procedure does have diagnostic value, draining more than a standard safe amount at once is not mandatory, and it does not worsen effusion in all cases.