Table 2.

The Total CV (%) of K, Na, and Cl for Roche Quality Control Materials in Six Selected Labs

Analyte	Electrolyte	Lab 1	Lab 2	Lab 3	Lab 4	Lab 5	Lab 6	Opt	Des	Min	Standarda
Precipath U	K	0.99	1.36	1.43	1.79	0.82	b	1.2	2.4	3.6	2.5
	Na	0.96	1.24	1.16	1.05	0.66	b	0.2	0.4	0.5	1.5
	Cl	1.85a	1.17	1.53a	1.18	1.65a	b	0.3	0.6	0.9	1.5
Precinorm U	K	1.26	1.97	1.57	1.91	0.9	1.31	1.2	2.4	3.6	2.5
	Na	1.09	1.49	1.41	1.47	0.6	1.15	0.2	0.4	0.5	1.5
	Cl	1.96a	1.54a	2.09a	1.66a	1.79a	1.36	0.3	0.6	0.9	1.5

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

^bDue to misoperation of the test, Lab 6 could not provide the data.

Opt, optimal requirement of group biological variation 6; Des, desirable requirement of group biological variation 6; Min, minimal requirement of group biological variation 6.