Test Id : CTBBL
Mycobacterial Culture, Blood
Useful For
Suggests clinical disorders or settings where the test may be helpful
Diagnosing mycobacteremia
Reflex Tests
Lists tests that may or may not be performed, at an additional charge, depending on the result and interpretation of the initial 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 |
| LCTB | Id, MTB complex Rapid PCR | No, (Bill Only) | No |
Testing Algorithm
Delineates situations when tests are added to the initial order. This includes reflex and additional tests.
When this test is ordered, the reflex tests may be performed at an additional charge.
Method Name
A short description of the method used to perform the test
Continuously Monitored Automated Broth Culture Instrument with Conventional Methods for Identification of Mycobacteria
NY State Available
Indicates the status of NY State approval and if the test is orderable for NY State clients.
Reporting Name
Lists a shorter or abbreviated version of the Published Name for a test
Aliases
Lists additional common names for a test, as an aid in searching
Acid-Fast Bacilli (AFB)
AFB (Acid-Fast Bacilli)
Bacillus, Acid-Fast
Culture, TB (Tuberculosis)
MTB (Mycobacterium tuberculosis)
Mycobacteria Culture
Mycobacterium tuberculosis (MTB)
TB (Tuberculosis)
TB (Tuberculosis) Culture
Tubercle Bacilli: Mycobacterium tuberculosis
Tuberculosis (TB)
Testing Algorithm
Delineates situations when tests are added to the initial order. This includes reflex and additional tests.
When this test is ordered, the reflex tests may be performed at an additional charge.
Specimen Type
Describes the specimen type validated for testing
Whole blood
Shipping Instructions
Specimen must be processed within 7 days of collection.
Necessary Information
Specimen source is required.
ORDER QUESTIONS AND ANSWERS
| Question ID | Description | Answers |
|---|---|---|
| Q00M0015 | Specimen Source |
Specimen Required
Defines the optimal specimen required to perform the test and the preferred volume to complete testing
Container/Tube:
Preferred: Green top (sodium or lithium heparin)
Acceptable: SPS (sodium polyanethol sulfonate)
Specimen Volume: 8 to 10 mL per culture
Collection Instructions:
1. Send whole blood specimen in original tube.
2. SPS tubes are acceptable, but not preferred.
3. Note: SPS tubes must be clearly labeled as SPS. If label is obscured, sample may be canceled, as ACD (yellow top) is not an acceptable tube type.
Forms
If not ordering electronically, complete, print, and send a Microbiology Test Request (T244) with the specimen.
Specimen Minimum Volume
Defines the amount of sample necessary to provide a clinically relevant result as determined by the testing laboratory. The minimum volume is sufficient for one attempt at testing.
5 mL
Reject Due To
Identifies specimen types and conditions that may cause the specimen to be rejected
| Blood Culture bottles (eg, BACTEC mycoF Lytic, VersaTrek) Isolator Clotted | Reject |
Specimen Stability Information
Provides a description of the temperatures required to transport a specimen to the performing laboratory, alternate acceptable temperatures are also included
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Whole blood | Ambient (preferred) | 7 days | |
| Refrigerated | 7 days |
Useful For
Suggests clinical disorders or settings where the test may be helpful
Diagnosing mycobacteremia
Testing Algorithm
Delineates situations when tests are added to the initial order. This includes reflex and additional tests.
When this test is ordered, the reflex tests may be performed at an additional charge.
Clinical Information
Discusses physiology, pathophysiology, and general clinical aspects, as they relate to a laboratory test
Mycobacteremia occurs most often in immunocompromised hosts.
Mycobacterial blood cultures may be indicated for patients presenting
Reference Values
Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.
Negative
If positive, mycobacteria are identified.
A final negative report will be issued after 42 days of incubation.
Interpretation
Provides information to assist in interpretation of the test results
A positive result may support the diagnosis of mycobacteremia.
Cautions
Discusses conditions that may cause diagnostic confusion, including improper specimen collection and handling, inappropriate test selection, and interfering substances
Results must be interpreted in conjunction with the patient's history and clinical picture.
A negative result does not rule out mycobacteremia. The organism may be present at quantities below the limit of detection or may be transiently present.
If Mycobacterium genavense is suspected, indicate on request form or contact laboratory. Mycobactin J (an iron supplement) will then be added to the culture to support growth.
Supportive Data
During validation of this test, a variety of mycobacteria were recovered from spiked blood specimens. These mycobacteria were Mycobacterium fortuitum, Mycobacterium intracellulare, Mycobacterium kansasii, Mycobacterium tuberculosis, and Mycobacterium xenopi. Mycobacterium genavense was recovered when the medium was supplemented with mycobactin J (an iron supplement). In addition, aerobic actinomycetes including Nocardia farcinica, Gordonia terrae, Rhodococcus equi, and Tsukamurella paurometabola were also recovered when spiked into blood. The limit of detection was determined to be less than or equal to 10(2) colony forming units (CFU)/mL for Mycobacterium fortuitum and Mycobacterium tuberculosis, 10 CFU/mL for Mycobacterium intracellulare, and 1 CFU/mL for Nocardia farcinica.
Clinical Reference
Recommendations for in-depth reading of a clinical nature
1. Martin I, Pfyffer GE, Parrish N. Mycobacterium: General characteristics, laboratory detection, and staining procedures. In: Carroll KC, Pfaller MA, Landry ML, et al, eds. Manual of Clinical Microbiology. 12th ed. ASM Press; 2019:558-575
2. Crump JA, Morrissey AB, Ramadhani HO, et al. Controlled comparison of BacT/Alert MB system, manual myco/f lytic procedure, and isolator 10 system for diagnosis of mycobacterium tuberculosis bacteremia. J Clin Microbiol. 2011;49(8):3054-7. doi:10.1128/JCM.01035-11
3. Reimer LG. Laboratory detection of mycobacteremia. Clin Lab Med. 1994;14(1):99-105
Method Description
Describes how the test is performed and provides a method-specific reference
The blood is processed per the manufacturer's instructions before adding it to a VersaTREK Myco bottle and plating onto Middlebrook 7H10 agar. The agar plate is incubated at 37 degrees C with 5% to 7% carbon dioxide for 42 days. The VersaTREK Myco bottle is incubated on the automated VersaTREK 528 instrument for 42 days. If the bottle signals as positive on the instrument, it is removed, and a smear is performed to look for acid-fast organisms. Acid-fast organisms are identified using conventional methods including real-time PCR, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry, and 16S rDNA gene sequencing.(Mirrett S, Hanson KE, Reller LB. Controlled clinical comparison of VersaTREK and BacT/ALERT blood culture systems. J Clin Microbiol. 2007;45[2]:299-302; Buckwalter SP, Olson SL, Connelly BJ, et al. Evaluation of Matrix-Assisted Laser Desorption Ionization-Time of Flight Mass Spectrometry for the Identification of Mycobacterium species, Nocardia species, and Other Aerobic Actinomycetes. J Clin Microbiol. 2016;54[2]:376-384. doi:10.1128/JCM.02128-15; Hall L, Doerr KA, Wohlfiel SL, Roberts GD. Evaluation of the MicroSeq system for identification of mycobacteria by 16S ribosomal DNA sequencing and its integration into a routine clinical mycobacteriology laboratory. J Clin Microbiol. 2003;41[4]:1447-1453)
PDF Report
Indicates whether the report includes an additional document with charts, images or other enriched information
Day(s) Performed
Outlines the days the test is performed. This field reflects the day that the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time before the test is performed. Some tests are listed as continuously performed, which means that assays are performed multiple times during the day.
Monday through Sunday
Report Available
The interval of time (receipt of sample at Mayo Clinic Laboratories to results available) taking into account standard setup days and weekends. The first day is the time that it typically takes for a result to be available. The last day is the time it might take, accounting for any necessary repeated testing.
Specimen Retention Time
Outlines the length of time after testing that a specimen is kept in the laboratory before it is discarded
Performing Laboratory Location
Indicates the location of the laboratory that performs the test
Fees :
Several factors determine the fee charged to perform a test. Contact your U.S. or International Regional Manager for information about establishing a fee schedule or to learn more about resources to optimize test selection.
- Authorized users can sign in to Test Prices for detailed fee information.
- Clients without access to Test Prices can contact Customer Service 24 hours a day, seven days a week.
- Prospective clients should contact their account representative. For assistance, contact Customer Service.
Test Classification
Provides information regarding the medical device classification for laboratory test kits and reagents. Tests may be classified as cleared or approved by the US Food and Drug Administration (FDA) and used per manufacturer instructions, or as products that do not undergo full FDA review and approval, and are then labeled as an Analyte Specific Reagent (ASR) product.
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
Provides guidance in determining the appropriate Current Procedural Terminology (CPT) code(s) information for each test or profile. The listed CPT codes reflect Mayo Clinic Laboratories interpretation of CPT coding requirements. It is the responsibility of each laboratory to determine correct CPT codes to use for billing.
CPT codes are provided by the performing laboratory.
CPT codes are provided by the performing laboratory.
87116-Mycobacterial Culture
87118-Id MALDI-TOF Mass Spec AFB (if appropriate)
87150-Id, Mtb Speciation, PCR (if appropriate)
87153-Mtb PZA Confirmation, pcnA sequence (if appropriate)
87153-Mycobacteria Identification by Sequencing (if appropriate)
87150- Id, MTB complex Rapid PCR (if appropriate)
LOINC® Information
Provides guidance in determining the Logical Observation Identifiers Names and Codes (LOINC) values for the order and results codes of this test. LOINC values are provided by the performing laboratory.
| Test Id | Test Order Name | Order LOINC Value |
|---|---|---|
| CTBBL | Mycobacterial Culture, B | 64412-0 |
| Result Id | Test Result Name |
Result LOINC Value
Applies only to results expressed in units of measure originally reported by the performing laboratory. These values do not apply to results that are converted to other units of measure.
|
|---|---|---|
| CTBBL | Mycobacterial Culture, B | 64412-0 |