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Test ID CTB Mycobacteria and Nocardia Culture, Varies

Useful For

Detection and identification of Mycobacterium species, Nocardia species, and other aerobic actinomycetes

 

Identification is performed using the Hologic/GenProbe AccuProbes for selected Mycobacterium species, matrix assisted laser desorption ionization-time of flight (MALDI-TOF) mass spectrometry, or 500-base pair 16S rRNA gene sequencing

 

M tuberculosis complex species identification can be done upon request using rapid PCR targeting the regions of difference (RD) genomic areas

Method Name

Automated Detection of Positive Cultures Followed by Organism Identification with Rapid Methods, which may include Nucleic Acid Probes, DNA Sequencing, and Matrix Assisted Laser Desorption/Ionization-Time of Flight (MALDI-TOF) Mass Spectrometry

Reporting Name

Mycobacterial Culture

Specimen Type

Varies


Necessary Information


1. Specimen source is required.

2. Alert the laboratory if Mycobacterium genavense is suspected, as this species requires addition of mycobactin J to the culture medium for optimal growth and recovery.



Specimen Required


Submit only 1 of the following specimens:

 

Specimen Type: Body fluid

Container/Tube: Sterile container

Specimen Volume: 1 mL

 

Specimen Type: Bone marrow

Container/Tube: SPS/Isolator System or green top (lithium heparin)

Specimen Volume: Entire collection

 

Specimen Type: Gastric washing

Container/Tube: Sterile container

Specimen Volume: 10 mL

Collection Instructions: Neutralize specimen within 4 hours of collection with 100 mg of sodium carbonate per 5 to 10 mL of gastric wash.

 

Specimen Type: Respiratory

Sources: Bronchoalveolar lavage fluid, bronchial washing, sputum

Container/Tube: Sterile container

Specimen Volume: 3 mL

Collection Instructions:

1. Collect 3 respiratory specimens for acid-fast smears and culture in patients with clinical and chest X-ray findings compatible with tuberculosis.

2. These 3 specimens should be collected at 8- to 24-hour intervals (24 hours when possible) and should include at least 1 first-morning specimen.

 

Specimen Type: Stool

Supplies: Stool Collection Kit, Random (T635)

Container/Tube: Sterile container

Specimen Volume: 5-10 g

 

Specimen Type: Tissue

Container/Tube: Sterile container

Specimen Volume: 5-10 mm

Collection Instructions: Collect a fresh tissue specimen.

 

Specimen Type: Urine

Container/Tube: Sterile container

Specimen Volume: 20-50 mL

Collection Instructions: Collect a random urine specimen.

 

Fresh tissue or body fluid is the preferred specimen type instead of a swab specimen.

Specimen Type: Swab

 

Sources: Wound, tissue, or body fluid

Container/Tube: Culture transport swab (noncharcoal) culturette

Specimen Volume: Adequate specimen

Collection Instructions:

1. Before collecting specimen, wipe away any excessive amount of secretion and discharge, if appropriate.

2. Obtain secretions or fluid from source with sterile swab.

3. If smear and culture are requested or both a bacterial culture and mycobacterial culture are requested, collect a second swab to maximize test sensitivity.


Specimen Minimum Volume

Body Fluid: 1.5 mL
Respiratory Specimen: 3 mL
Fresh Tissue: pea-sized piece

Specimen Stability Information

Specimen Type Temperature Time
Varies Refrigerated (preferred) 7 days
  Ambient  7 days

Reference Values

Negative

Day(s) and Time(s) Performed

Monday through Sunday; Continuously

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

87116-Mycobacterial Culture

87015-Mycobacteria Culture, Concentration (if appropriate)

87118-Id MALDI-TOF Mass Spec AFB (if appropriate)

87150-Mycobacteria Probe Ident, Solid (if appropriate) 

87150-Mycobacteria Probe Ident, Broth(if appropriate)

87150-Id, Mtb Speciation, PCR (if appropriate)

87153-Mycobacteria Identification by Sequencing (if appropriate) 

87176-Tissue Processing (if appropriate)

LOINC Code Information

Test ID Test Order Name Order LOINC Value
CTB Mycobacterial Culture 50941-4

 

Result ID Test Result Name Result LOINC Value
CTB Mycobacterial Culture 50941-4

Test Classification

This test has been cleared or approved by the U.S. 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.

Testing Algorithm

When this test is ordered, a reflex test may be performed and charged.

 

The following algorithms are available in Special Instructions:

-Mycobacterium and Nocardia Culture Algorithm

-Meningitis/Encephalitis Panel Algorithm

NY State Approved

Yes

Reflex Tests

Test ID Reporting Name Available Separately Always Performed
ISMY ID by 16S Sequencing No, (Bill Only) No
RMALM Id MALDI-TOF Mass Spec AFB No, (Bill Only) No
RTBSP Id, Mtb Speciation, PCR No, (Bill Only) No
TBMP Mycobacteria Probe Ident No, (Bill Only) No
TBPB Mycobacteria Probe Ident Broth No, (Bill Only) No
TBT Concentration, Mycobacteria No, (Bill Only) No
TISSR Tissue Processing No, (Bill Only) No

Forms

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