Table 3.

Specificity of Abbott SARS-CoV-2 IgM and IgG assays on NAAT Negative patients.

Group Characteristics		Results
			IgM	IgG
N	66	Positive	0	0
Median Age	5.5 Y	Negative	66	66
Age Range	28 D to 20 Y	NPAa	100%	100%
Male	40 (61%)
Female	26 (39%)	Median Index (S/C)	0.05	0.02
		Average Index (S/C)	0.03	0.05
Collection Period	4/14/20 to 5/12/20	Range of Index (S/C)	0.01 to 0.27	0 to 0.73

IgM Index (S/C) ​≥ ​1.00 is Positive.

IgG Index (S/C) ​≥ ​1.4 is Positive.

The Index (S/C) is the result unit fo rthe assays and is the sample result divided by the calibrator result.

The Index (S/C) is the result unit fo rthe assays and is the sample result divided by the calibrator result.

^aNPA ​= ​Negative Percent Agreement.