Testing for TB infection increases the probability that individuals who are considered for TB preventive treatment (TPT) will benefit from such treatment. IGRAs and TBSTs use Mycobacterium tuberculosis specific antigens and represent a significant advancement to TST which has been used for over half a century.
The WHO consolidated guidelines are accompanied by an operational handbook which provides laboratory personnel, clinicians as well as ministries of health and technical partners detailed guidance on how to implement the WHO evidence-based recommendations on TB infection tests. The document describes the WHO recommended tests, test procedures, a model algorithm, and the steps required to scale-up TB infection testing within a health programme.
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WHO consolidated guidelines on tuberculosis: module 3: diagnosis: tests for TB infection
WHO operational handbook on tuberculosis: module 3: diagnosis: tests for tuberculosis infection