Ordering Recommendation

Determine in vitro susceptibility to antimicrobial agents for gram-positive rod bacterial organisms.

New York DOH Approval Status

This test is New York state approved.

Specimen Required

Patient Preparation

Actively growing isolate in pure culture.

Specimen Preparation

Transport sealed container with pure culture on agar slant or in bacterial transport media. Place each specimen in an individually sealed bag.

Storage/Transport Temperature

Room temperature. If culture is suspected of being a microorganism identified on the IATA list as an infectious substance affecting humans, submit specimen according to Infectious Substance, Category A, shipping guidelines.

Unacceptable Conditions

Mixed cultures or nonviable organisms.


Isolate identification and specimen source required.


Ambient: 1 week; Refrigerated: Unacceptable; Frozen: Unacceptable


Broth Microdilution




2-5 days

Reference Interval

Susceptible, intermediate, or resistant

Interpretive Data

Susceptibility testing is performed by CLSI-approved broth microdilution method using custom-made MIC panels.

Compliance Category

Laboratory Developed Test (LDT)


The following agents will be tested: cefriaxone, clindamycin, daptomycin, doxycycline, erythromycin, gentamicin, levofloxacin, meropenem, penicillin, rifampin, trimethoprim-sulfamethoxazole, and vancomycin. Selective reporting by organism and source.

An additional processing fee will be billed for all organisms not submitted in pure culture, as indicated in the specimen requirements.

If species identification is not provided, identification will be performed at ARUP. Additional charges apply.

Hotline History


CPT Codes



Component Test Code* Component Chart Name LOINC
0060346 Susceptibility, Gram Positive Rod 29576-6
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.


  • Actinomycetes
  • Corynebacterium species
  • Diptheroids
  • Erysipelothrix; Bacillus
  • Lactobacillus
  • Nocardia
Antimicrobial Susceptibility - Gram Positive Rod