Pericardial fluid that is obtained from the heart is stained with a violet stain known as gram stain. The sample is then examined under the microscope for the presence of bacteria. The color, number, and morphologic appearance of the cells help make it possible to identify the organism. The test is performed when an infection of the heart is suspected, or when a pericardial effusion is present

Review Date: 12/7/2001 12:00:00 AM Reviewed By:A.D.A.M. Medical Illustration Team

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