Sign in →

Test ID QFT3 QuantiFERON-TB Gold In-Tube for Detection of Latent Tuberculosis, Blood

Useful For

Indirect test for Mycobacterium tuberculosis complex infection (latent tuberculosis infection)


This test should not be used for diagnosis of active tuberculosis (TB) infection.


This test can be used as an aid to detect latent TB infection.


A single positive result by this test should not be used solely to diagnose latent TB. Results should be considered alongside exposure and clinical presentation.

Method Name

Enzyme-Linked Immunosorbent Assay (ELISA)

Reporting Name

QuantiFERON-TB Gold In-Tube, B

Specimen Type

Whole blood

Specimen Required


Standard Altitude: QuantiFERON-QTB Gold In-Tube Collection Kit (T628)

High Altitude: QuantiFERON High Altitude Collection Kit (T649)

Collection Instructions:

1. Special collection, incubation, and centrifugation procedures must be followed.

2. Prepare and transport specimen per QuantiFERON-TB (QTB) Gold Collection and Processing Instructions (T688); available in Special Instructions.

Specimen Minimum Volume

1 mL per tube (3 tubes)

Specimen Stability Information

Specimen Type Temperature Time
Whole blood Refrigerated 28 days

Reference Values


Day(s) and Time(s) Performed

Monday through Friday, 9 a.m.

Performing Laboratory

Mayo Medical Laboratories in Rochester

Test Classification

This test has been cleared or approved by the U.S. Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
QFT3 QuantiFERON-TB Gold In-Tube, B 71775-1


Result ID Test Result Name Result LOINC Value
QFTQ QuantiFERON-TB Gold Result 71773-6
DEXQ1 TB Ag minus Nil Result 64084-7
DEXQ3 Mitogen minus Nil Result 71774-4
DEXQ4 Nil Result 71776-9


If not ordering electronically, complete, print, and send a General Request Form (T239) with the specimen (