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HelpTest Code LAB2999 Quantiferon TB Gold Plus
Additional Codes:
QFTG TB
Notes:
Note: Blood must be drawn in ONE Lithium Heparin tube NO GEL. Minimum volume is critical. Specimens not meeting minimum volume requirements will be rejected.
Collection:
Specimen: Blood
Container: Collect one DARK GREEN Lithium Heparin tube NO GEL.
Volume: 6mL; Minimum 5mL
Storage/Transport Temperature:
Specimen must be refrigerated within 3 hours after blood collection. Specimen may be refrigerated for up to 48 hours.
Turnaround Time (TAT):
Average TAT is 3 Days. See more details in 'Test Availability.'
Test Availability:
Test is ran Tuesday-Sunday.
Samples recieved before 10am will be processed into 4 QuantiFERON tubes that day. Samples must then incubated for 16-24 hours. Average Turn Around Time is 3 days.
Send To:
UMC MAIN LABORATORY Specimen Receiving – EH319 Extension Hospital
Reference Interval:
| Nil (IU/mL) | TB1 minus Nil (IU/mL) | TB2 minus Nil (IU/mL) | Mitogen minus Nil (IU/mL) | Liaison QuantiFERON TB Result | Report/Intrepretation |
| ≤ 8.0 | ≥ 0.35 and ≥ 25% of Nil |
Any | Any | Positive | M. tuberculosis infection likely |
| Any | ≥ 0.35 and ≥ 25% of Nil |
||||
| < 0.35 OR ≥ 0.35 and < 25% of Nil |
< 0.35 OR ≥ 0.35 and < 25% of Nil |
≥ 0.5 | Negative | M. tuberculosis infection NOT likely |
|
| < 0.35 OR ≥ 0.35 and < 25% of Nil |
< 0.35 OR ≥ 0.35 and < 25% of Nil |
< 0.5 | Indeterminate | Likelihood of M. tuberculosis infection cannot be determined |
|
| >8.0 | Any | ||||