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Test ID QFT4 QuantiFERON-TB Gold Plus, Blood

Ordering Guidance

This test is not recommended for use for diagnosis of active tuberculosis (TB) infection. It can be used as an aid to detect latent TB infection.

Specimen Required


-QuantiFERON-TB Gold Plus Collection Kit (T794)

-QuantiFERON-TB Gold Plus HIGH ALTITUDE Collection Kit (T795)

Collection Instructions:

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

2. For blood collection options (1-tube collection or 4-tube collection) and specimen transport instructions, see Mycobacterium tuberculosis Infection Determination by Quanti-FERON-TB Gold Plus Collection and Processing Instructions (T688).

Useful For

Indirect test for Mycobacterium tuberculosis infection, to be used in conjunction with risk assessment, radiography, and other medical and diagnostic evaluations


This test is not recommended for use for diagnosis of active tuberculosis infection.

Method Name

Chemiluminescence Immunoassay (CLIA)/Enzyme-Linked Immunosorbent Assay (ELISA) as appropriate

Reporting Name

QuantiFERON-Tb Gold Plus, B

Specimen Type

Whole blood

Specimen Minimum Volume

4 mL: 1 mL per tube (4 tubes)

Specimen Stability Information

Specimen Type Temperature Time Special Container
Whole blood Refrigerated 28 days QTBKIT

Reference Values


Day(s) Performed

Monday through Friday

Report Available

2 to 5 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test has been cleared, approved, or is exempt by the US 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
QFT4 QuantiFERON-Tb Gold Plus, B 71775-1


Result ID Test Result Name Result LOINC Value
QFTQ2 QuantiFERON-Tb Gold Plus Result 71773-6
DEXQE TB1 Ag minus Nil Result 64084-7
DEXQF TB2 Ag minus Nil Result 88517-8
DEXQG Mitogen minus Nil Result 71774-4
DEXQH Nil Result 71776-9


If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:

-General Request (T239)

-Infectious Disease Serology Test Request (T916)

-Microbiology Test Request (T732)