Test Details
Mnemonic
QFTBT
Ordering Code
3000897
CPT-4 Code(s)
86480
Specimen Information
The specimen must be submitted in the Warde-provided collection tube due to the requirements of the laboratory automation. No other lithium-heparin tubes are acceptable.
Collect and send sample Monday thru Friday only. Do not collect on Saturday and Sunday, holidays, or the day before a holiday.
Collection instructions can be found here.
Collect
Quantiferon - TB Green lithium heparin
Specimen Preparation
Collect 6.0 mL of whole blood directly into a Warde provided Quantiferon-TB Plus green lithium heparin collection tube. Slowly invert the tube a minimum of 10 times to dissolve the heparin. Allow tube to sit at room temperature for 15 minutes. After 15 minutes at room temperature, refrigerate the specimen within three hours of collection and transport to Warde. Send the specimen to Warde the same day it is collected.
Minimum Volume
5.0 mL
Transport Temperature
Refrigerated
Rejection Criteria
Frozen whole blood, plasma, clotted sample, specimens not in Warde provided Quantiferon - TB lithium heparin collection tubes, specimens received in collection tubes containing less than 5 mL
Stability
Room temperature: 3 hours
Refrigerated: 48 hours
Frozen: Unacceptable
Refrigerated: 48 hours
Frozen: Unacceptable
Methodology
Chemiluminescence Immunoassay (CLIA)
Reference Range
Negative
Performing Laboratory
Warde Medical Laboratory
New York DOH Approval Status
Yes