The specimen is obtained by thoracentesis (a needle aspiration of fluid in the pleural space). The chest is cleansed with antibacterial soap. The area is anesthetized with local anesthetic. Then, a needle is placed between the ribs, and a sample of fluid is withdrawn from the chest.
You may feel a stinging sensation when the anesthetic in injected. You may feel some pressure and slight localized pain when the thoracentesis needle enters the pleural space. A chest X-ray is usually done following the test to be sure the lung tissue was not affected by the test.
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