Topics
A to Z
Data &
 Statistics
Forms &
Publications
News &
Advisories
Licensing &
Certification
Rules &
Regulations
Public Health
Directory
Print this Article   Bookmark and Share

Mycobacterium - MTD test

Updated

11/1/2013

Other Names Amplified Mycobacterium tuberculosis Direct Test
How to Order
Check the MTD box under the Mycobacterium Section of the General Microbiology Request Form
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
1 to 5 days
CPT Code
87550


Specimen Collection Details

Collection

Primary respiratory samples from County Health Departments are collected as per instructions at:
public.health.oregon.gov/LaboratoryServices/Documents/tb.pdf page 2

NALC-NaOH concentrated respiratory samples from Private Care Laboratories are submitted as per instructions at:
public.health.oregon.gov/LaboratoryServices/Documents/tb.pdf

Optimal Volume

Primary County respiratory samples:  1 – 5 ml

Private Care Lab concentrated pellets: 0.5ml – 1ml
Minimum Volume

Primary County respiratory samples:  1 ml

Private Care Lab concentrated pellets: 0.5ml
Handling
Keep specimen refrigerated (2-8C) pending transport
Transport

Primary samples: Delivery within 5 days of collection

Concentrate pellets: Delivery within 2 days of concentration. Transport at 2 -8 C.
Note: Specimens shipped for Friday delivery must be received in lab by 12:00PM
Rejection Criteria
Unlabeled specimens, specimens not submitted per collection instructions, or specimens received without a completed requisition forms will not be processed. 
Comments

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:
public.health.oregon.gov/DiseasesConditions/CommunicableDisease/Tuberculosis/Pages/index.aspx