Table 1. The sensitivity and specificity of the optimal cutoffs for signal-to-noise (S/N) and optical density (OD) was calculated for the IgG and IgG4 assays.

(SN = Signal/Noise Ratio, OD = Optical Density).

	Sensitivity (%)	Specificity (%)	Cutoff
SNIgG	98.6	98.7	6.7
SNIgG4	95.9	100	1.8
ODIgG	98.6	98.7	0.24
ODIgG4	95.9	100	0.07