Language Selection


Antimicrobial Susceptibility Testing

<<Return to Laboratory

Requisition Forms

Reference Details


Antimicrobial susceptibility testing of Gram positive organisms.

Test Category:
Susceptibility Testing
Gram positive organisms
Illnesses and Diseases:
  • Colonizations
  • Bacteraemia
  • Urinary tract infection
  • Wound

Pure culture.

Collection Method:


Specimen Processing, Storage and Shipping:

Send cultures as growth on culture medium or in transport medium. Culture vessel should be leak-proof or sealed appropriately.

Transportation of Dangerous Goods:

Shipping of specimens shall be done by a TDG certified individual in accordance with TDG regulations. For additional information regarding classification of specimens for the purposes of shipping, consult either Part 2 Appendix 3 of the TDG Regulations or section 3.6.2 of the IATA Dangerous Goods Regulations as applicable.


Patient Criteria:


Accompanying Documentation:

Completed Antimicrobial Resistance and Nosocomial Infections Requisition.


Gram positive organisms may include but are not limited to: Staphylococcus aureus, and Enterococcus sp. Please consult with lab prior to submitting rarely tested organisms or those that require specialized growth conditions.

Methods and Interpretation of Results:

Susceptibility testing is performed at the discretion of the lab by Etest, broth microdilution or Vitek2. Results are interpreted according to breakpoints published by CLSI, FDA or EuCAST.

Turnaround Time:

8 calendar days.

Phone #: (204) 789-5000
Fax: (204) 789-5020
  1. CLSI. Performance Standards for Antimicrobial Susceptibility Testing, 33rd informational supplement, M100-S27. 2023. Wayne, PA: Clinical and Laboratory Standards Institute.
  2. The European Committee on Antimicrobial Susceptibility Testing (EuCAST). Breakpoint tables for interpretation of MICs and zone diameters. Version 13, 2023. http//
Fact Sheets:
Related Information: