QUANTIFERON®-TB GOLD (QFT)/TB-IGRA (INTERFERON GAMMA RELEASE ASSAY)

What this test checks

Measures immune response to TB bacteria proteins — confirms TB infection (latent or active).

Why do people get this test?

More specific than Mantoux skin test, especially in BCG-vaccinated people.

When you should consider this test

• TB contact screening
• Before starting immunosuppressive medicines
• Pre-employment TB screen

How to prepare

No fasting needed.