Quantiferon Gold Plus
This test is a blood-based interferon-gamma release assay (IGRA) used as an aid in the diagnosis of Mycobacterium tuberculosis infection. It is an immune response-based, indirect test for M tuberculosis infection (including disease) and is intended for use in conjunction with risk assessment, radiography, and other medical and diagnostic evaluations. Additional testing is needed to determine if a person who has tested positive has latent tuberculosis (TB) infection or TB disease.
- Portal Ordering Code
QFT
- CPT Code(s)
86480
- Storage and Transport Criteria
-
Specimen Storage Specimen Transport Acceptable SpecimensMinimum VolumeFrozen Range
-70°C - 0°CRefrigerated Range
0.1°C - 8°CRoom Temperature Range
8.1°C - 30°CStability at
4°C - 25°CLi-Heparin plasma, non-incubated Li-Heparin plasma-6 mls Reject Acceptable at 2°C – 8°C up to 48 hours Acceptable at 17°C – 25°C up to 12 hours 8 hours - Includes
N/A
- Methodology
ELISA
- Assay Category
FDA Approved
- Reference Range
See laboratory report
- Alternative Names
- QFT Gold Plus
- IGRA
- QFT Plus
- TB Gold
- QFT TB
- Preferred Specimen(s)
Li-Heparin plasma, 1 tube, non-incubated
- Alternative Specimen(s)
Quantiferon-TB Gold Plus Blood Collection Tubes (1 mL per tube)
- Minimum Volume
Li-Heparin plasma-6 mls
- Special Instructions
Collect a minimum of 6 mL of blood by venipuncture into a lithium heparin (green-top) tube. Gently mix by inverting the tube several times to dissolve the heparin.
Refrigerate at 2-8° C. Note that when using QuantiFERON®-TB Gold Plus, blood samples must be processed within 16 to 48 hours after collection while white blood cells are still viable.- Reject Criteria
- Inadequately labeled specimens
- Leaking specimens
- QNS (quantities not sufficient)
- Specimens not meeting the Storage & Transport criteria upon receipt at laboratory
- Setup Schedule
Testing done once a week.
- Turn around time (TAT)
7 business days from arrival at the lab
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