Tuberculosis Blood Test (IGRA / QuantiFERON)

Tuberculosis (TB) is a serious infectious disease that usually affects the lungs but can also impact other parts of the body such as lymph nodes, kidneys, bones and joints. From a community health perspective, testing international students who will be studying abroad for extended periods is effective in preventing and reducing the risk of group infections.

What is IGRA?

Among the available testing methods, the TB blood test (also known as IGRA) is the most reliable and convenient. IGRA is an advanced and accurate method for detecting TB infection. By analyzing the immune response to TB proteins in a small blood sample, it can accurately detect whether an individual has been infected. If the IGRA result is positive, you may need a chest x-ray and a consultation with a doctor to rule out active TB disease.

Why Choose IGRA?

IGRA testing offers several advantages:

• Convenience: Unlike the TB skin test, IGRA only requires one blood draw, making it very convenient for busy urban dwellers.
• Accuracy: Ideal for individuals who have received the BCG vaccine. Compared to the skin test, IGRA provides more reliable results.
• Reliability: IGRA rarely produces false-positive results, effectively avoiding unnecessary follow-ups. This is particularly important for students who are about to depart for their studies. Additionally, some countries (such as the United States) may require IGRA as the specified method for TB screening by their schools or institutions. Be sure to understand your institution's specific testing requirements before getting tested.

Conclusion

The TB blood test (IGRA) is a convenient choice for individuals who have received the BCG vaccine. Shoebill collaborates with HOKLAS-accredited laboratories in Hong Kong to provide the US FDA-approved QuantiFERON®-TB Gold Plus (QFT-Plus) test, ensuring reliable results. We welcome you to book an appointment at Shoebill Co-Traveller - Travel Health Management Center for IGRA and other tests to prepare for your studies abroad in advance!

Reference: Clinical Testing Guidance for Tuberculosis: Interferon Gamma Release Assay (CDC, 2024)