TABLE 1.

Diagnostic performance and clinical relevance of the SARS-CoV-2 NP ELISA (n = 604 patients)

		No. of patients with SARS-CoV-2 RNA PCR test result
Time of blood collection	NP ELISA result	Positive, inpatients	Positive, outpatients	Negative, outpatients	Total	Relevance (prediction)
Days 0–6	Positive	92	35	1	128	99.2%
	Negative	7	8	461	476	96.8%
	Total	99	43	462	604
Sensitivity		92.9%	81.4%
Specificity				99.8%
Days 7–13	Positive	39			39
	Negative	5			5
	Total	44			44
Sensitivity		88.6%