Table 4.

Performance of SARS-CoV-2 IgG ELISA using dried blood spots compared with serum samples

		Serum Samples, n (%)		Total
		Seropositive	Seronegative
Dried blood spots	Seropositive	100 (100)	1 (0.5)	101 (34.4)
	Seronegative	0 (0)	193 (99.5)	193 (65.6)
	Total	100 (100)	194 (100)	294 (100)
Sensitivity (95% CI): 100.0% (96.4–100.0%) Specificity (95% CI): 99.5% (97.2–100.0%) Positive Predicted Value (95% CI): 99.0% (93.4–99.9%) Negative Predicted Value (95% CI): 100.0% (97.6–100.0%) False-Negative (95% CI): 0% (0–3.6%) False-Positive (95% CI): 0.5% (0–2.8%) Cohen’s κ Value (95% CI): 99.2% (97.8–100%) Lin’s Concordance Correlation Coefficient (95% CI): 97.3% (96.7–97.8%)