QuantiFERON Gold vs T-SPOT: IGRA TB Testing

In the United States, there are two Interferon-Gamma Release Assay (IGRA) tests, approved by the United States Food and Drug Administration (FDA): TB Gold and T-SPOT TB Test. These are single visit, blood tests and must be administered by a medical professional then sent to a laboratory for analysis. They are a popular alternative to the traditional TB Skin Test.

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