Table 1.

The Results of K, Na, and Cl for SRM 956c in Six Selected Labs of China

		956c‐I			956c‐II			956c‐III
Electrolyte	Lab	Target	Measurement	Bias (%)	Target	Measurement	Bias (%)	Target	Measurement	Bias (%)	Mean bias (%)	Standarda (%)
K	1	5.976	b	b	3.977	3.89	−2.19	1.982	1.90	−4.14	−3.17c	±2
(mmol/l)	2		5.83	−2.44		3.95	−0.68		2.22	12.01	2.96c
	3		6	0.40		4.1	3.09		2.10	5.95	3.15c
	4		6.04	1.07		3.98	0.08		2.06	3.94	1.70
	5		6.03	0.90		4.02	1.08		2.04	2.93	1.64
	6		6.06	1.41		4.04	1.58		2.02	1.92	1.64
Na	1	118.8	b	b	137.5	137.0	−0.33	157.4	152.2	−3.29	−1.81c	±1.5
(mmol/l)	2		120.3	1.23		136.9	−0.41		161.5	2.63	1.15
	3		121.6	2.36		139.0	1.09		154.4	−1.91	0.51
	4		120.2	1.18		139.0	1.09		166.2	5.59	2.62c
	5		120.7	1.57		139.3	1.29		158.0	0.36	1.07
	6		123.1	3.60		140.5	2.15		154.2	−2.05	1.23
Cl	1	104.9	b	b	121.5	119.0	−2.09	137.4	133.8	−2.65	−2.37c	±1.5
(mmol/l)	2		102.9	−1.89		118.0	−2.88		140.6	2.34	−0.81
	3		103.4	−1.43		120.0	−1.23		132.0	−3.93	−2.20c
	4		103.3	−1.56		119.4	−1.71		143.4	4.38	0.37
	5		102.4	−2.35		119.2	−1.93		135.8	−1.19	−1.82
	6		104.3	−0.59		120.8	−0.58		134.3	−2.27	−1.15

^aHealth industry standards of China 7 were applied as the standard.

^bDue to rupture of the container, Lab 1 could not provide the data.

^cThe bias is beyond the range of the standard.