TABLE.

Performance summary of the ID NOW COVID-19 test

A.		NAT/NP
		Positive	Negative
ID NOW COVID-19	Positive	2	3
	Negative	2	1093
Sensitivity	50% (95% CI, 6.8 to 93.2)
Specificity	99.7% (95% CI, 99.2 to 99.9)
Positive likelihood ratio	182.7 (95% CI, 40.9 to 815.2)
Negative likelihood ratio	0.50 (95% CI, 0.19 to 1.34)
Positive predictive value	40.0 (95% CI, 13.0 to 74.8)
Negative predictive value	99.8 (95% CI, 99.5 to 99.9)

B.		NAT/NP
		Positive	Negative (considered negative if Ct >25)
ID NOW COVID-19 performance with modified definitions*	Positive (on repeat sample)	2	0
	Negative (not repeated)	0	1,098
Sensitivity	100% (95% CI, 15.8 to 100)
Specificity	100% (95% CI, 99.7 to 100)
Positive predictive value	100% (34.2–100%)
Negative predictive value	100% (99.7–100%)

* ID NOW COVID-19 considered positive only after two positive results on separate samples and laboratory NAT considered negative if Ct > 25

CI = confidence interval; Ct = cycle threshold; NAT/NP = nucleic acid testing/nasopharyngeal

A) Samples with single ID NOW COVID-19 test; B) Samples with positives repeated by ID NOW COVID-19