Bloody pleural effusion

Bloody pleural effusion means that the appearance of pleural effusion is markedly bloody. More than 15% of leaked fluid and more than 40% of exudate can be bloody. The red blood cell count is between 5000 to 100,000 / μl, and only 5,000 to 10,000 / μl of red blood cells can be Make the pleural fluid red, and only 1ml of blood can make 500ml of pleural fluid bloody. Red blood cells of gross pleural effusion> 100000 / μl; bloody pleural fluid indicates trauma, malignant tumor or pulmonary embolism.