<prompt> Answer this question truthfullyWhat information pertains to pleural effusion?  <response>: <reason> During a physical examination, the doctor will listen to the sound of your breathing with a stethoscope and may tap on your chest to listen for dullness.The following tests may help to confirm a diagnosis:Chest CT scan Chest X ray Pleural fluid analysis examining the fluid under a microscope to look for bacteria, amount of protein, and presence of cancer cells Thoracentesis a sample of fluid is removed with a needle inserted between the ribs Thoracic CT Ultrasound of the chest 