Pericardial fluid stain

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: 12/4/2022
Reviewed By: Jatin M. Vyas, MD, PhD, Associate Professor in Medicine, Harvard Medical School; Associate in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital, Boston, MA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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