Methicillin resistant staphylococcus aureus laboratory findings: Difference between revisions
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===Cultures=== | ===Cultures=== | ||
Culture of the bacteria is the gold standard test for the diagnosis of MRSA infections. Samples used for culture include blood, urine, joint fluid, sputum, pus from abscesses and boils. | Culture of the bacteria is the gold standard test for the diagnosis of MRSA infections. Samples used for culture include blood, urine, joint fluid, sputum, pus from abscesses and boils. | ||
[[Mannitol Salt Agar]], which is a selective medium with 7–9% [[Sodium chloride|NaCl]] that allows ''S. aureus'' to grow producing yellow-colored colonies as a result of salt utilization and subsequent drop in the medium's [[pH]] | [[Mannitol Salt Agar]] is used as a culture medium, which is a selective medium with 7–9% [[Sodium chloride|NaCl]] that allows ''S. aureus'' to grow producing yellow-colored colonies as a result of salt utilization and subsequent drop in the medium's [[pH]] | ||
==References== | ==References== | ||
Revision as of 20:32, 14 August 2012
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Laboratory Findings
- Complete blood count and differential count - low red cell count, leukocytosis, thrombocytopenia
- Grams staining - gram positive cocci are seen.
- C reactive protein - elevated
- ESR - elevated
- Aspiration of joint fluid for:
- Cell count
- Grams stain
- Cultures
- Liver function tests - elevated transaminases may be seen (e.g toxic shock syndrome)
- Serum creatinine - elevated
Cultures
Culture of the bacteria is the gold standard test for the diagnosis of MRSA infections. Samples used for culture include blood, urine, joint fluid, sputum, pus from abscesses and boils. Mannitol Salt Agar is used as a culture medium, which is a selective medium with 7–9% NaCl that allows S. aureus to grow producing yellow-colored colonies as a result of salt utilization and subsequent drop in the medium's pH