To remove fluid for laboratory analysis, your doctor may suggest a procedure called thoracentesis. In this procedure, your doctor first injects a local anesthetic, then inserts a needle through your chest wall between your ribs to remove fluid. In addition, a sample of tissue (pleural biopsy) for microscopic analysis may be obtained if your doctor is concerned that the fluid collection may be caused by tuberculosis or cancer. If only a small amount of fluid is present, your doctor may insert the needle with the help of ultrasound guidance over the site of the fluid.
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