Features	BD Directigen Flu A+B17,18	BD Directigen Flu A4,18–20	FLU OIA4,18,20–23	QuickVue Influenza A/B Test17,18,24	ZstatFlu4,18,20,21,25,26
Approved for use in CLIA-waived laboratories	No	No	No	Yes*	Yes
Distinguishes between influenza A and B viruses	Yes	No	No	No	No
Cost per test	$20 to $24	$17 to $20	$12 to $17	$15 to $18	$20
Assay time	15 minutes	15 minutes	15 minutes	10 minutes	20 minutes
Number of steps	9	11	7	3	4
Preferred specimen	Nasopharyngeal aspirate	Nasopharyngeal washing or aspirate	Nasopharyngeal swab	Nasopharyngeal washing or aspirate	Throat swab
Sensitivity	67% to 96%	60% to 77%	62% to 88%	73% to 81%	51% to 72%
Specificity	88% to 97%	80% to 90%	52% to 80%	96% to 99%	93% to 100%
Shelf life	<1 year	Variable	1 year	1 year	3 years
Storage	Room temperature	Room temperature	4°C to 8°C (39.2°F to 46.4°F)	Room temperature	Room temperature
Batching	No	No	No	No	Yes
Portability	Yes, with media	Yes, liquid transport	1 hour only	Yes, must be refrigerated	>24 hours without media