Hello @cindyconstien,

In a pleural fluid analysis or thoracentesis, your doctor will remove fluid from the pleural membrane area by inserting a needle into the chest cavity and suctioning the fluid into a syringe. The fluid will then be tested to determine the cause.
Pleurodesis, is a treatment that creates mild inflammation between the lung and chest cavity pleura. After drawing the excess fluid out of the chest cavity, a a talc mixture is injected into the area which causes the two layers of the pleura to stick together, which prevents the future buildup of fluid between them. https://www.mayoclinic.org/diseases-conditions/pleurisy/diagnosis-treatment/drc-20351866

You might also be interested in this conversation where @blueot and @lisakuehl have written about pleural effusion: https://connect.mayoclinic.org/discussion/pleurisy/