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Test Code TBQFT TB (QuantiFERON®) GOLD

Methodology

In vitro diagnostic test using a peptide cocktail simulating ESAT-6, CFP-10, and TB7.7(p4) proteins to stimulate cells in heparinized whole blood. Detection of interferon-γ (IFN-γ) by enzyme-linked immunosorbent assay (ELISA) is used to identify in vitro responses to these peptide antigens that are associated with Mycobacterium tuberculosis infection.

 

This is an indirect test which is useful for detecting Mycobacterium tuberculosis infection (including disease). It is intended for use in conjunction with risk assessment, radiography, and other medical and diagnostic evaluations.

Performing Laboratory

Kalispell Regional Medical Center Laboratory

Specimen Requirements

Container/Tube: 3 TBQFT collection tubes (gray-top, red-top, and purple-top)
Specimen Volume: 3 mL of blood total
Collection Instructions:

  1. Draw blood in 3 special, TBQFT collection tubes (gray-top, red-top, and purple-top).
  2. Allow each tube to fill completely to black mark (1 mL).
  3. shake each tube vigorously up and down 10 times. 
  4. Do NOT centrifuge.

Reference Values

Negative

Day(s) Test Set Up

Monday, Wednesday and Friday

Test Classification and CPT Coding

86480

Specimen Requirements Additional Information

Specimen Stability:

Ambient: 16 hours

Refrigerated: not acceptable

Frozen: not acceptable

Specimen Transport Temperature

Ambient/Refrigerate NO/Frozen NO