Table 1.

Precision Studies of the Elecsys Anti–SARS-CoV-2 S-Ab Assay^a

SARS-CoV-2 Controls	Within Run (n = 20)			Between Day (n = 23)
	Mean, U/mL	SD, U/mL	CV, %	Mean, U/mL	SD, U/mL	CV, %
Low positive control	0.96	0.014	1.50	1.02	0.03	3.2
High positive control	8.95	0.081	0.91	8.98	0.22	2.4

CV, coefficient of variation; S-Ab, spike protein antibody.

^aA positive S-Ab assay result was defined by a measured S-Ab concentration ≥0.8 U/mL. CV (%) = (SD/mean) × 100.