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Regional Medical Lab
Test Directory


TB Gold Quantiferon Plus

Order Name TB Gold Plus
Test Number: 5587326
Revision Date 10/24/2019
Test Name Methodology LOINC Code
Immunoassay 64084-7 
Immunoassay 88517-8 
TB Mitogen-NIL
Immunoassay 71774-4 
TB NIL Value
Immunoassay 71776-9 
TB Gold Interp
Interpretive information. 71773-6 
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 6 mL (5 mL) Whole Blood Lithium Heparin (Dark Green Top / No-Gel) Refrigerated
Alternate 1 See Instructions Whole Blood TB Gold Plus 4 tube kit Room Temperature
Instructions Collect: Preferred - Whole blood in Dark Green no gel Lithium Heparin, 6 ml tube (Minimum 5 ml required)
Alternate (must be trained and signed off by RML personnel prior to collecting!)
Whole blood in Quantiferon TB Gold Plus 4 tube kit (0.8 ml minimum per tube required).
Specimen Prep:
Lithium Heparin: Fill tube completely, gently mix by inverting several times, incubate at room temp for a minimum of 15 minutes and ship to lab refrigerated.
TB Gold Plus 4 tube kit: Immediately after filling, gently shake tube 10 times to coat the inner surface of the tube walls (overly vigorous shaking may lead to aberrant results), transport to the lab at room temp (must be received in-lab at RML within 16 hours of collection OR incubated at 37°C for 16 - 24 hours at the client site prior to transport to the lab).
Stability: Lithium Heparin - 48 hours refrigerated
TB Gold Plus 4 tube kit - 16 hours room temp, unincubated. Once incubated at 37°C for 16 - 24 hours, tubes may be held for up to 3 days at 4-27°C prior to centrifugation. After centrifugation, tubes are stable up to 28 days at 2-8 °C.
Testing Schedule Monday - Friday 
Expected TAT 4 - 6 days  
CPT Code(s) 86481
Lab Section Immunology - Serology