How to Interpret QuantiFERON-TB Gold Results?

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QuantiFERON-TB Gold (QFT) is a simple blood test. It helps to detect Mycobacterium tuberculosis, the bacteria which causes tuberculosis (TB).
QFT uses unique blood collection tubes that enable immediate exposure of viable blood lymphocytes to highly specific TB antigens (ESAT-6/CFP-10/TB-7.7(p4)). Antigen exposure produces a quantifiable immune response to aid in the diagnosis of TB infection.
QFT is highly specific and sensitive: a positive result is strongly predictive of true infection with M. tuberculosis (Find out the detailed intrepretations in the pictures below). However, QFT cannot distinguish between active tuberculosis disease and latent tuberculosis infection. It is intended for use with risk assessment, radiography, and other medical and diagnostic evaluations. In addition, QFT is just a diagnostic aid and cannot replace clinical judgment.
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