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Lab Test Dictionary

QuantiFERON-TB Gold Plus, 4 Tubes, Draw Site Incubated (36971)


Immunoassay (IA)


TB Gold; QFT Gold Plus; QFT TB; QFT Plus; IGRA

Specimen Type

See Collection Instructions

Performing Lab

Quest Diagnostics San Juan Capistrano

Epic ID


Lab Test Days


Standard TAT

2 Days

Collection Information

Specimen Required

0.8-1 mL Blood collected in the 4 QFT-Plus blood collection tubes

Container Type

See Below

Collection Instructions

For each patient, collect 1 mL of blood by venipuncture directly into each of the 4 QFT-PLUS blood collection tubes. These tubes should be at 17-25 C at the time of draw. If a "butterfly needle" is being used, a "purge" tube should be used to ensure that the tubing is filled with blood prior to the QFT(R)-Plus tubes being used. Immediately after filling the tubes, shake them 10 times just firmly enough to ensure the entire surface of the tube is coated with blood, to solubilize antigens on tube walls.

Processing Information - Lab Use Only

Transport Temperature


Specimen Stability

Room Temp: 72 Hours; Refrigerated: 72 Hours; Frozen: Unacceptable

Rejection Criteria

Non-incubated specimens; Received frozen

Test Volume Required

1 mL (x4) Incubated Blood

Minimum Test Volume

0.8 mL (x4) Incubated Blood

Processing Instructions

Each of the four tubes must be transferred to a 37 C + or - 1 C incubator as soon as possible and within 16 hours of collection for 16-24 hours. If the blood is not incubated immediately after collection, re-mixing of the tubes by inverting 10 times must be performed immediately prior to incubation. The specimen rack should sit off the floor of the incubator and the tubes should be upright. Following incubation, immediately transport the 4 collection tubes to Quest Diagnostic between 4 and 27 C. Samples will be stable for 72 hours at 4-27 C refrigerated or at room temperature.

CPT Codes