TABLE 1.

Comparison of calculated amounts of IFN-γ using the Q-IFN ELISA with two different methods of standard curve development

Absorbance	Actual concn of IFN-γ (IU/ml)	IFN-γ concn (IU/ml) from the standard curve by the indicated method
		Point-to-point	Best linear fit
3.531	137.2	149.3	142.6
2.134	69.6	75.2	80.5
1.346	34.8	38.6	45.5
0.49	8.4	7.9	7.5
0.358	4.2	4.2	1.6
0.148	0	−0.1	−7.7