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HelpTest Code LAB0292649 Antimicrobial Susceptibility, Aerobic Bacteria, Varies
Infectious
Additional Codes
| Mayo Test ID |
|---|
| ZMMLS |
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Useful For
Determining the in vitro susceptibility of aerobic bacteria involved in human infections
Testing Algorithm
When this test is ordered, the reflex tests may be performed at an additional charge.
All aerobically growing bacteria submitted will automatically have susceptibility testing performed and billed as appropriate. Antimicrobial agents appropriate to the organism and specimen source will be tested according to Mayo Clinic's practice and the laboratory's standard operating procedures.
If appropriate, testing for mecA will be performed by polymerase chain reaction (PCR) under MECAB / Methicillin Resistance Gene, mecA Test (Bill Only). Indications for mecA testing include inadequate growth by phenotypic antimicrobial susceptibility testing, lack of current organism breakpoints for oxacillin or cefoxitin, and assessment of discrepancies between cefoxitin and oxacillin phenotypic testing results.
In the event that an isolate of Helicobacter pylori does not grow from a client sample or does not grow for susceptibility testing, reflex testing for HPCR1 / Helicobacter pylori with Clarithromycin Resistance Prediction, Molecular Detection, PCR (Bill Only) may be added.
The following tables provide a listing of the antimicrobials routinely tested as well as antimicrobials that may be tested upon request. These tables are organized by isolate groups and are not all inclusive. Call 800-533-1710 and ask to speak to the Bacteriology Antimicrobial Susceptibility Testing Laboratory if the organism or antimicrobial of interest are not listed in these tables.
-Aerobic Gram-Negative Bacilli Antimicrobials
-Additional Gram-Negative Bacteria Antimicrobials
-Staphylococcus, Enterococcus, Bacillus, and Related Genera Antimicrobials
-Additional Gram-Positive Bacteria Antimicrobials
For test utilization options, see Helicobacter pylori Diagnostic Algorithm.
Special Instructions
Method Name
Minimal Inhibitory Concentration (MIC) (Agar Dilution or Broth Microdilution or Gradient Diffusion) or Disk Diffusion(if appropriate)
Reporting Name
Susceptibility, Aerobic, MICSpecimen Type
VariesOrdering Guidance
Mayo Clinic Laboratories will not perform susceptibility testing on select agents (eg, Bacillus anthracis, Brucella species, Burkholderia mallei, Burkholderia pseudomallei, Francisella tularensis, and Yersinia pestis). Consult with your state health department or the Centers for Disease Control and Prevention regarding antimicrobial susceptibility testing of such isolates. For more information see www.selectagents.gov/sat/list.htm.
Shipping Instructions
1. See Infectious Specimen Shipping Guidelines
2. Place specimen in a large infectious container and label as an etiologic agent/infectious substance.
Necessary Information
Organism identification and specimen source are required.
Specimen Required
Supplies: Infectious Container, Large (T146)
Container/Tube: Agar slant or other appropriate media
Specimen Volume: Organism in pure culture
Collection Instructions:
1. Perform isolation of infecting bacteria.
2. Organism must be in pure culture, actively growing. Do not submit mixed cultures.
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Varies | Ambient (preferred) | ||
| Frozen | |||
| Refrigerated | |||
Reject Due To
| Agar plate | Reject |
Reference Values
Susceptibility results are reported as minimal inhibitory concentration (MIC) in mcg/mL. Breakpoints (also known as clinical breakpoints) are used to categorize an organism as susceptible, susceptible-dose dependent, intermediate, resistant, or nonsusceptible according to breakpoint setting organizations, either the Clinical and Laboratory Standards Institute (CLSI) or the European Committee on Antimicrobial Susceptibility Testing (EUCAST), as applicable.
In some instances, an interpretive category cannot be provided based on available data; therefore, the following comment will be included on the report: There are no established interpretive guidelines for agents reported without interpretations.
For information regarding CLSI and EUCAST susceptibility interpretations, see Susceptibility Interpretative Category Definitions.
Interpretation
A "susceptible" category result and a low minimum inhibitory concentration value indicate in vitro susceptibility of the organism to the antimicrobial tested.
Refer to Reference Values for interpretation of various antimicrobial susceptibility interpretive categories (ie, susceptible, susceptible-dose dependent, intermediate, nonsusceptible, resistant, or epidemiological cutoff value).
Day(s) Performed
Monday through Friday
Report Available
4 to 7 daysSpecimen Retention Time
Bacterial isolates: 30 days.Test Classification
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.CPT Code Information
87077-Ident by MALDI-TOF mass spec (if appropriate)
87185-Beta lactamase (if appropriate)
87186-Antimicrobial Susceptibility, Aerobic Bacteria, MIC-per organism for routine battery (if appropriate)
87181-Susceptibility per drug and per organism for drugs not in routine battery (if appropriate)
87150-H pylori + Clarithro Resistance PCR (if appropriate)
87150-mecA PCR (if appropriate)
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| ZMMLS | Susceptibility, Aerobic, MIC | 50545-3 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| ZMMLS | Susceptibility, Aerobic, MIC | 21070-8 |
Reflex Tests
| Test ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|
| RMALD | Ident by MALDI-TOF mass spec | No, (Bill Only) | No |
| BLA | Beta Lactamase | No, (Bill Only) | No |
| SUS | Susceptibility | No, (Bill Only) | No |
| HPCR1 | H pylori + Clarithro Resistance PCR | No, (Bill Only) | No |
| MECAB | mecA PCR Test, Bill Only | No, (Bill Only) | No |
Forms
If not ordering electronically, complete, print, and send a Microbiology Test Request (T244) with the specimen.
Additional Tests
| Test ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|
| MIC | Susceptibility, MIC | No, (Bill Only) | Yes |