Table 2.

Inter-day precision and accuracy (n = 6).

Sample	Nirmatrelvir				Ritonavir
	Spike	Amount detected	Accuracy*	CV**	Spike	Amount detected	Accuracy*	CV**
	(ng/mL)	(ng/mL)	(%)	(%)	(ng/mL)	(ng/mL)	(%)	(%)
LLOQ	10	8.95	−10.5	7.31	2	1.68	−16.2	6.40
QC-low	20	21.8	9.19	9.46	4	3.63	−9.28	4.31
QC-med	500	536	7.30	5.56	100	102.1	2.14	3.48
QC-high	6000	6222	3.70	4.48	1200	1270	5.87	2.84

^*Accuracy: relative difference from expected value.

^**CV: coefficient of variation.