Antimicrobial Susceptibility - Viridans Streptococcus
Also known as: MA VIRS
Use
This test determines the in vitro susceptibility of viridans streptococci to a panel of antimicrobial agents. It is clinical significant for guiding therapy in infections caused by viridans streptococcus, particularly in cases where antibiotic resistance may be a concern. Viridans streptococci are part of the normal flora in the oral cavity but can cause opportunistic infections, especially in individuals with damaged heart valves or weakened immune systems. Susceptibility testing helps in selecting appropriate antibiotics for treatment.
Special Instructions
The test requires an actively growing isolate in pure culture. The specimen should be transported in a sealed container with pure culture on an agar slant and placed in an individually sealed bag. Isolate identification and specimen source must be provided. An additional processing fee is billed for organisms not submitted in pure culture, while species identification will incur additional charges if not provided.
Limitations
The test is limited by the conditions under which susceptibility testing is performed, using a CLSI-approved broth microdilution method with custom-made MIC panels. Mixed cultures, nonviable organisms, and incorrect specimen submissions will affect the reliability of the results by potentially introducing additional fees or requiring retesting. The results must be interpreted in conjunction with clinical findings to ensure accurate therapeutic guidance.
New York Approved
Methodology
Culture-based
Biomarkers
LOINC Codes
- 29576-6
Result Turnaround Time
2-5 days
Related Documents
For more information, please review the documents below
Specimen
Cultured Cells
Volume
Not provided
Minimum Volume
Not provided
Container
Sealed container on agar slant
Collection Instructions
Transport sealed container with pure culture on agar slant. Place each specimen in individually sealed bag.
Patient Preparation
Actively growing isolate in pure culture.
Causes for Rejection
Mixed cultures or nonviable organisms.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 1 week |
| Refrigerated | Unacceptable |
| Frozen | Unacceptable |