What Does High Mitogen Nil Mean
In the context of interferon-gamma release assays (IGRAs) such as the QuantiFERON-TB Gold test, ‘mitogen nil’ refers to the difference between the mitogen (positive control) and nil (negative control) values. A high mitogen nil result generally indicates a strong immune response to the mitogen, confirming that the patient’s immune system is capable of producing interferon-gamma and that the test result is valid.
