IGRA TB Testing
IGRA Test UK: Private QuantiFERON TB Blood Testing
If you are searching for an IGRA test UK, you may have been advised to check for TB exposure, latent TB or occupational health risk. An IGRA test is a blood test that can support investigation of TB infection.
At AIS Health Check, the TB Blood Test - QuantiFERON Gold provides private testing with clear doctor-led guidance.
What is an IGRA test?
IGRA stands for interferon-gamma release assay. It is a blood test that measures how your immune cells respond to specific TB-related proteins.
QuantiFERON-TB Gold is one type of IGRA test. It may help identify whether your immune system has previously reacted to TB bacteria, which can support investigation of latent TB infection or previous exposure.
IGRA test vs TB skin test
There are different ways to investigate possible TB infection. The Mantoux test is a skin test, while an IGRA test is a blood test.
| Feature | IGRA / QuantiFERON blood test | TB skin test |
|---|---|---|
| Sample | Blood sample | Skin injection and later reading |
| Purpose | May help assess immune response to TB bacteria | May help assess immune response to TB exposure |
| Follow-up | Results should be interpreted with symptoms and history | Requires correct timing and measurement of skin reaction |
Who may need an IGRA test?
An IGRA test may be considered if you:
- have had close contact with someone with TB
- need private occupational health or workplace screening
- have moved from or spent time in an area where TB is more common
- are being assessed before certain immune-suppressing medicines
- have been advised to check for latent TB infection
- want a private TB blood test rather than a skin test
What IGRA test results may mean
Negative: TB infection may be less likely, but interpretation depends on your exposure history, immune system and timing of possible contact.
Positive: Your immune system has reacted to TB-related antigens. This may suggest TB infection, but it does not tell you whether TB is active or latent.
Indeterminate: The result is unclear and may need repeat testing or medical review.
Limits of IGRA testing
An IGRA test can provide useful information, but it is not a complete TB assessment on its own.
- It does not diagnose active TB by itself.
- It cannot reliably distinguish active TB from latent TB.
- It should be interpreted alongside symptoms, medical history and exposure risk.
- It does not replace a UK visa TB certificate where official screening is required.
When a blood test is not enough
If you have symptoms such as a persistent cough, coughing up blood, fever, night sweats, chest pain or unexplained weight loss, you should seek medical advice promptly. You may need clinical assessment and further tests.
Book your private IGRA test
AIS Health Check offers a private TB Blood Test - QuantiFERON Gold for people who want clear, doctor-led guidance on TB blood testing.
Frequently asked questions
Is an IGRA test the same as QuantiFERON?
QuantiFERON-TB Gold is a type of IGRA test. IGRA is the broader category of blood tests that measure immune response to TB-related antigens.
Can an IGRA test detect latent TB?
It may help identify immune response linked to TB infection, including possible latent TB. A result should be interpreted alongside your symptoms, exposure history and medical background.
Does a positive IGRA mean I have active TB?
No. A positive IGRA suggests TB infection may be present, but it does not confirm active TB. Further medical assessment may be needed.
Can I book an IGRA test privately in the UK?
Yes. AIS Health Check offers private QuantiFERON TB blood testing with clear guidance on what your result may mean and what to consider next.
Is this test suitable for UK visa paperwork?
No. If you need a UK visa TB certificate, follow the official visa screening process. A private IGRA blood test is not a replacement for a Home Office-approved certificate.