Table 2. Internal quality control data for the analytes tested.

Analytes	Reagent manufacturers	Mean*	SD	CV (%)	Mean CV (%)†
ALT (U/L)	Abbott	28	0.93	3.37	2.70
		97	1.96	2.03
	Leadman	28	1.04	3.67	3.25
		94	2.68	2.83
	Mindray	29	0.86	3.02	2.63
		97	2.18	2.24
	Zybio	33	1.63	4.98	3.84
		101	2.71	2.69
AST (U/L)	Abbott	42	0.85	2.01	1.66
		189	2.47	1.31
	Leadman	41	1.13	2.74	2.24
		190	3.28	1.73
	Mindray	44	0.96	2.19	1.82
		199	2.88	1.44
	Zybio	44	1.61	3.61	2.40
		195	2.33	1.19
urea (mmol/L)	Abbott	5.5	0.12	2.21	2.41
		17.1	0.44	2.6
	Leadman	5.6	0.26	4.63	4.63
		15.6	0.72	4.62
	Mindray	6.0	0.14	2.37	3.02
		16.5	0.06	3.67
	Zybio	5.9	0.41	7.01	5.18
		16.7	0.56	3.34
UA (μmol/L)	Abbott	286	2.98	1.04	0.82
		586	3.53	0.6
	Leadman	289	2.73	0.95	0.87
		572	4.45	0.78
	Mindray	289	4.33	1.50	1.14
		577	4.45	0.77
SD – standard deviation. CV – coefficient of variation. ALT – alanine aminotransferase. AST – aspartate aminotransferase. UA – uric acid. *The mean data of internal quality control with two levels were accumulated for 20 consecutive days. †The mean CV were the average data of 2 QC levels of CV.