Days Set Up
Monday - Friday
Analytic Time

2 - 5 days

Soft Order Code

Test Updated:


Antibiotic Combination Studies
Antimicrobial Synergy Study
Synergy Studies, Antibiotic
Antimicrobial Susceptibility, MBC
Minimum Bactericidal Concentration
Susceptibility Testing, Bactericidal Levels
Susceptibility Testing, MBC
Antibiotic Synergy Studies

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Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

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Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

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Test Overview

Test Methodology

Minimum Bactericidal Concentration (MBC) and Minimum Inhibitory Concentration (MIC)

Test Usage

Determining the in vitro susceptibility of aerobic bacteria involved in human infections. An MBC identical to or very close to a sufficiently low MIC indicates that significant killing of the organism has occurred. A "susceptible" category result and a low MIC value indicate in vitro susceptibility of the organism to the antimicrobial tested. Both the MIC and MBC should be within the range of usually achievable antibiotic blood levels for the organism to be considered "susceptible" (inhibited or killed) to the antimicrobial.

Reference Range

Interpretive report provided.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Onsite

When an MBC test is desired, the physician must request that the patient`s isolate be saved within 7 days of initial culture date, and arrange with the Microbiology lab to prepare the bacterial isolate for the MBC test. Indicate organism identification, antibiotic(s) to be tested, specimen source, and collection date/time.

Collection Offsite

Bacteria should be in pure culture, actively growing, placed in a proper mailing container (agar plates are not acceptable), and labeled as an etiologic agent. Keep at room temperature. If culture was done by MLabs, contact the MLabs Client Services Center within 7 days of initial culture date to request that the patient's isolate be saved for MBC testing. Indicate organism identification, antibiotic(s) to be tested, specimen source, and collection date/time.

Minimum Volume

Billing Information

CPT Code
87186, 87187
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.