interpretation of quantiferon-tb gold plus results
QuantiFERON-TB Gold Plus: Results and Interpretation When it comes to result calculation, qualitative cutoff values, and result interpretation, the QFT-Plus is identical to the QFT-Gold assay, with the key exception that if either one or both of the QFT-Plus TB antigen tubes are equal to or greater than 0.35 IU/mL and are at least 25% of the nil tube value, the patient is considered positive.