Table 4.

Sensitivity and Specificity of the Combined S1 RBD and N Protein and Albumin Subtracted iELISA for IgG, IgM, and IgA Antibodies

	IgG	IgM	IgA
AUC	0.9839	0.9606	0.9441
Specificity	98.07%	98.48%	98.10%
Sensitivity	95.72%	83.47%	82.60%
Accuracy	96.34%	93.93%	93.40%
Population positivity cutoff	1.23 U/mL	23.09 U/mL	6.36 U/mL
Kappa	0.95	0.9	0.89

AUC, area under the curve.