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Test ID TB1LN Antimicrobial Susceptibility, Mycobacterium tuberculosis Complex, First Line, Varies


Additional Testing Requirements

CTB / Mycobacteria and Nocardia Culture or CTBID / Culture Referred for Identification, Mycobacterium and Nocardia 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.


If not ordering electronically, complete, print, and send a Microbiology Test Request (T244) with the specimen.

Useful For

Rapid, qualitative susceptibility testing of Mycobacterium tuberculosis complex isolates growing in pure culture


Affirming the initial choice of chemotherapy for M tuberculosis infections


Confirming the emergence of drug resistance


Guiding the choice of alternate agents for therapy for M tuberculosis infections

Additional Tests

Test ID Reporting Name Available Separately Always Performed
STV1 Susceptibility, Mtb Complex, Broth No, (Bill Only) Yes

Reflex Tests

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

Testing Algorithm

When this test is ordered, the additional test will always be performed and charged separately.

If resistance to a first line antimicrobial agent is detected reflex testing for confirmation of resistance and second line agents will be performed and charged.

Method Name

Broth Dilution at Critical Drug Concentrations

Reporting Name

Susceptibility, Mtb Complex, 1 Line

Specimen Type


Specimen Stability Information

Specimen Type Temperature Time Special Container
Varies Ambient (preferred)

Reference Values

Results are reported as susceptible or resistant.

Day(s) Performed

Monday through Sunday

Report Available

10 to 21 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

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

87188 x 3-Antimicrobial Susceptibility, Mycobacterium tuberculosis Complex, Broth Method

87186-Susceptibility, Mtb Cx, 2nd Line (if appropriate)

LOINC Code Information

Test ID Test Order Name Order LOINC Value
TB1LN Susceptibility, Mtb Complex, 1 Line 29579-0


Result ID Test Result Name Result LOINC Value
TB1LN Susceptibility, Mtb Complex, 1 Line 29579-0