Home
HelpTest Code TB4 TB Quantiferon
Specimen Requirements
Specimen Type: Whole Blood
Container/Tube: Green Top (Li Heparin)
Volume: 4.0mL tube (2 full tubes)
Minimum Volume: Whole blood, 5.0 mL (2 full tubes)
Collection Instructions:
Kindly ensure specimen reach 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.
Sample Stability
** Preferred temperatures for storage prior to and during shipping to NUH **
| Specimen Type: | Whole Blood |
|---|---|
| Ambient: | 16 hours |
| Refrigerate: | NA |
| Frozen: | NA |
Reference Interval
Negative
Days and Times Performed
Friday, TAT 2-8 days
Methodology
Enzyme Immunoassay
Service Code
0032148
Update
Last updated 16/02/2024
Updated on collection instructions.
Unacceptable Condition
| Haemolysis | NA |
|---|---|
| Icterus | NA |
| Lipaemic | NA |
| Others | Samples that arrive at laboratory > 16 hours after collection. Samples dispatched on eve of Public Holiday, Saturday and Sunday. |
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Alias
Interferon-gamma, QuantiFERON-TB Gold Plus
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).