Action of CEA of Pleural Fluid and Serum in Differential Diagnosis of Benign or Malignant of Pleural Effusion

Objective To discuss the action of CEA in serum and pleural fluid in differential diagnosis whether the pleural effusion is benign or malignant.Methods The CEA content in serum and in pleural cavity extracted first time were detected with radio-immunity method.Results The CEA in serum and in pleural fluid of benign were in normal range with ratio of CEAp/CEAs less than 1.The CEA in serum was normal or higher in malignancy,CEA in pleural fluid was higher than normal with ratio more than 1of CEAp/CEAs.Conclusion The detection of CEA simultaneously in both serum and pleural effusion might be the data to differentiate the diagnosis of benign or malignancy.