TABLE 1.

Effect of adding NMS to sample diluent to remove false reactivity of plasma in the human IFN-γ EIA

Type of normal human plasmaa	Level of added human IFN-γ (IU/ml)	EIA optical density (450 nm)
		No NMS	20% NMS
Nonreactive	0	0.069	0.062
	50	1.475	1.419
Falsely reactive	0	2.548	0.063
	50	2.735	1.422

^aPlasma from unstimulated blood donation.