Comparison of blood cultures obtained simultaneously by venepuncture and from vascular lines |
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Authors: | Patricia Tafuro Donald Colbourn Inge Gurevich Paul Schoch Harriet Wachs Sharon Krystofiak Burke A. Cunha |
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Affiliation: | 1. Department of Medicine, Winthrop-University Hospital, Mineola, New York U.S.A.;2. Department of Pathology, Winthrop-University Hospital, Mineola, New York U.S.A.;3. Infection Control, St. Clare''s Hospital, New York, New York U.S.A. |
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Abstract: | This study was designed to compare blood cultures drawn simultaneously from a pulmonary artery line or arterial line (line) and a peripheral site by venepuncture (VP). Two or three cultures were obtained by VP and from a line during each febrile episode in 79 patients. Line blood cultures were falsely negative in 1.3% of cultures and VP blood cultures were falsely negative in 2.0%. Three point eight per cent of blood cultures drawn from lines were falsely positive (contaminated), and 1.7% of VP cultures were falsely positive. No significant correlation was found between falsely positive line cultures and a positive three-way tap culture, line in use for 4 days or more, insertion of line during an emergency. We recommend that in the critically ill patient an arterial or pulmonary artery line may be used for obtaining reliable cultures. |
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