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Mycobacteriology: MTD test | | Updated | 12/13/2009 | | Other Names |
Gen-Probe Amplified Mycobacterium tuberculosis Direct Test, NAAT for TB | | How to Order |
Under the Mycobacterium Section on the red General Microbiology Request Form Hand Write “MTD” | | Availability |
Primary Samples: County and State Agencies NALC-NaOH concentrated pellets: Private Care Laboratories | | Methodology |
Gen-Probe Amplified Mycobacterium Tuberculosis Direct Test | | Performed |
Monday or Tuesdays and Thursdays | |
Time to Reporting
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CPT Code
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Specimen Collection Details
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Collection
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Optimal Volume
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Primary County respiratory samples: 1 – 5 ml Private Care Lab concentrated pellets: 0.5ml – 1ml | |
Minimum Volume
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Primary County respiratory samples: 1 ml Private Care Lab concentrated pellets: 0.5ml | |
Handling
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Keep specimen cold (2-8C) if transport is delayed | |
Transport
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Primary samples: Delivery within 5 days of collection. Private Care Lab concentrated pellets: Delivery within 3 days of concentration. Use appropriate shipping requirements. | |
Rejection Criteria
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Unlabeled specimens, specimens not submitted per collection instructions, or without completed requisition forms will not be processed. | |
Comments
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MTD is a Nucleic Acid Amplified Test (NAAT) that is FDA approved for respiratory samples from patients showing signs and symptoms consistent with active pulmonary tuberculosis (TB). This test is not approved for patients who have taken medication for active TB disease in the past 12 months or for more than 7 days recently. The predictive value is related to the smear result and the prevalence of disease in a given population group. The MTD test does not distinguish between viable and non-viable organisms.
For diagnostic guidelines see: https://public.health.oregon.gov/DiseasesConditions/CommunicableDisease/Tuberculosis/Pages/index.aspx
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