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HelpTest Code TB4 TB Quantiferon
Laboratory Code
LAB5105
Specimen Requirements
Specimen Type: Whole Blood
Container/Tube: Green Top (Li Heparin)
Volume: 4.0 mL tube (2 full tubes)
Minimum Volume: Whole blood, 5.0 mL (2 full tubes)
Collection Instructions:
Kindly ensure specimen reaches NUH Laboratory by 3pm on the same day of collection on Mondays to Thursdays ONLY. Specimens will not be accepted on Fridays, Saturdays, Sundays, eve of public holidays and on public holidays.
Specimen Stability
| Specimen Type | Whole Blood |
|---|---|
| Ambient | 16 hours |
| Refrigerate | Not available |
| Frozen | Not available |
Methodology
Enzyme Immunoassay
Days and Times Performed
Friday, TAT 2 - 8 days
Specimen Condition
| Haemolysis | OK |
|---|---|
| Icterus | OK |
| Lipaemia | OK |
| Others: Samples that arrive at laboratory > 16 hours after collection. Samples dispatched on eve of Public Holiday, Saturday and Sunday. | Reject |
Reference Interval
Negative
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
It can be used as an aid in diagnosing Mycobacterium tuberculosis infection, including both latent tuberculosis infection (LTBI) and tuberculosis (TB) disease. This enzyme-linked immunosorbent assay test detects the release of interferon-gamma in fresh heparinized whole blood from sensitized persons when it is incubated with mixtures of synthetic peptides simulating two proteins present in M. tuberculosis: early secretory antigenic target-6 (ESAT-6) and culture filtrate protein-10 (CFP-10). ESAT-6 and CFP-10 are secreted by all M. tuberculosis and pathogenic M. bovis strains. These proteins are absent from all Bacille Calmette-Guerin (BCG) vaccine strains and from commonly encountered non-tuberculous mycobacteria (NTM).
Service Code
32148
LOINC Code Information
| QFTC | 39017-9 |
|---|---|
| nil1r | 88518-6 |
| tb1nr | 64084-7 |
| tb2nr | 88517-8 |
| mitnr | 71774-4 |
Alias
Interferon-gamma
QuantiFERON-TB Gold Plus
Update
Last updated 21/02/2025