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Epic Code LAB3619 TB Screen (QuantiFERON® Gold Plus)

Test Name Alias

TB | Tuberculosis | Mycobacterium tuberculosis (MTB) | QFT | IGRA | LTBI | MTB | 7105

Interface Order Alias

55059

Quick Collect

LOOK+LOOK

Clinical Information

A positive result should not be the sole or definitive basis for determining infection with M. tuberculosis. It should be followed by further medical evaluation for active tuberculosis disease (e.g., Acid fast bacilli (AFB) smear and culture, chest x-ray).

 

Diagnosing or excluding tuberculosis disease, and assessing the probability of Latent TB Infection (LTBI), requires a combination of epidemiological, historical, medical, and diagnostic findings that should be taken into account when interpreting QuantiFERON® Gold Plus results. See General guidance on the diagnosis and treatment of TB disease and LTBI (http://cdc.gov/nchstp/tb/).

 

The performance of the USA format of the QFT test has not been extensively evaluated with specimens from individuals who have impaired or altered immune function, are younger than 17 years of age, or are pregnant.

Icons & Photos

Preferred Collection (1 tube) - 10 mL Lithium Heparin Green Non Gel tube
Do not substitute 6.0, 4.5 or 4.0 mL. Check that you are using Lithium and NOT Sodium.

 

Collection Instructions

 

LINK: Collection Quick Guide 

 

 

PREFERRED COLLECTION (1 TUBE)

Specimen Type: Blood
Container/Tube: 10 mL Lithium Heparin Green Non Gel (Room temparature)

  • Preferred Volume to Collect: 10 mL
  • Minimum Volume to Collect: 5 mL
  • Capillary collect ok? No
  • Microtainer acceptable: No

Collection Instructions: 

  • Must use 10 mL non-gel tube, cannot substitute with other tube sizes.
    • Do not use green lithium gel tubes
  • After collection, gently invert tube 8-10 times.
  • Specimen must be held at room temperature for at least 15 minutes and refrigerated within 3 hours.

Processing Instructions (Laboratory, Outpatient or Off-site collection)

  • Transport Temperature: Refrigerated
  • Please transport refrigerated specimens to the lab within 48 hours.

 

ALTERNATE COLLECTION (4 TUBE)

Corewell Health West is no longer supplying the 4-tube collection containers. If you need support on how to collect and process the 4-tube kit, please see collection quick guide link above.

 

Processing Instructions

• Tubes must remain at room temperature (22°± 5°C) after collection.

• Specimen must be transported and received at the reference lab as soon as possible and no later than 16 hours after collection.

• Upon arrival the tubes will be mixed and placed in a 37°C incubator.

 

If you recieve one lithium heparin 10 mL tube instead of four tubes, please refer to this document: Supply Change Notification

Specimen Stability

Lithium tube (1 tube):

 

  • Ambient: 15 minutes to 3 hours before refrigeration.
  • Refrigerated: Up to 48 hours before transfer to single tubes and incubation.

 

QFT 4 Tube set:

  • Ambient: 16 hours after collection

 

Laboratory Retention: 5 days

Test Frequency

Available Monday through Friday, usual turn-around time 2 to 4 days.

Reference Range

Negative

Performing Department

Immunochemistry

Performing Department Laboratory Location

Corewell Health Reference Laboratory, Grand Rapids, MI

Methodology

Interferon-gamma release assay

CPT

86480
Professional Fee for Pathologist Interpretation may apply

CDM Code

3028648001 

Epic Test ID

1230101919

LOINC

QuantiFERON-TB Gold: 71775-1

Mayo Access Code

SHO55059

Additional Information

As of 9/18/2018, three-tube collection kits are no longer accepted and will be canceled. 

Reviewed Date

12/13/2022

Updated Date

5/20/2024 - Removed Important Note, Replaced text in Alternate Collection 4-tube instructions, removed lab staff instructions and stability info for QFT.
10/18/2024 - added 4.5mL for tubes that shouldn't be subsituted.