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Test Code TB2LN Susceptibility, Mycobacterium tuberculosis Complex, Second Line, Varies


Useful For

Determination of Mycobacterium tuberculosis complex minimal inhibitory concentrations to second-line antimicrobial agents

Additional Tests

Test ID Reporting Name Available Separately Always Performed
STV2 Susceptibility, Mtb Cx, 2nd Line No, (Bill Only) Yes

Testing Algorithm

When this test is ordered, the additional test will always be performed at an additional charge.

Reporting Name

Susceptibility, Mtb Complex, 2 Line

Specimen Type


Additional Testing Requirements

CTB / Mycobacteria and Nocardia Culture, Varies or CTBID / Culture Referred for Identification, Mycobacterium and Nocardia, Varies must also be ordered and will be charged separately unless identification of organism is provided. 

Shipping Instructions

1. See Infectious Specimen Shipping Guidelines in Special Instructions.

2. Place specimen in a large infectious container (T146) and label as an etiologic agent/infectious substance.

Necessary Information

Specimen source and suspected organism identification are required. 


Specimen Required

Specimen Type: Organism

Supplies: Infectious Container, Large (T146)

Container/Tube: Middlebrook 7H10 agar slant

Specimen Volume: Isolate

Collection Instructions: Organism must be in pure culture, actively growing. 

Specimen Stability Information

Specimen Type Temperature Time Special Container
Varies Ambient (preferred)

Reference Values

Results are reported as minimal inhibitory concentration (MIC) values with units of mcg/mL and tentative interpretations of susceptible or resistant are provided.

Day(s) Performed

Monday through Sunday

Report Available

21 to 30 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test was developed, and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.

CPT Code Information

87186-Susceptibility, Mtb Cx, 2nd Line

LOINC Code Information

Test ID Test Order Name Order LOINC Value
TB2LN Susceptibility, Mtb Complex, 2 Line 29579-0


Result ID Test Result Name Result LOINC Value
TB2LN Susceptibility, Mtb Complex, 2 Line 29579-0

Method Name

Minimum Inhibitory Concentration (MIC) by Microtiter Broth Dilution Method