What is the procedure called that involves collecting pleural fluid for analysis?

The procedure that involves collecting pleural fluid for analysis is called thoracentesis. This is a medical procedure that is performed to remove excess fluid or air from the pleural space, which is the area between the lungs and the chest wall. During thoracentesis, a needle is inserted into the pleural space, usually between the ribs, to draw out fluid for diagnostic evaluation. The collected fluid can be tested for various conditions, including infections, inflammation, or cancer.

Pleurodesis, while related to the pleural space, is a procedure aimed at preventing the recurrence of pleural effusion by causing the pleurae to stick together. Endoscopy is a procedure used to examine the interior of a hollow organ or cavity in the body, while angiography is a medical imaging technique used to visualize the inside of blood vessels and organs. None of these options involve the direct collection of pleural fluid for analysis, which is why thoracentesis is the correct answer.