Establishment and Verification of Sex- and Age-Specific Serum Electrolyte Reference Intervals in Healthy Han Children in Changchun, Northeastern China

Table 1

Analytic parameters of electrolytes on Hitachi 7600-210 automatic analyzer.

Ions	Bias of accuracy (%)	Precision				Analytical measurement range (mmol/L)	Clinical reportable range (mmol/L)	Carryover rate (%)
		Low level (%)		High level (%)
		Within-day	Between-day	Within-day	Between-day
Potassium	0.71	0.005	0.013	0.081	0.009	2.06–9.09	2.06–9.08	0
Sodium	0.29	0.16	0.53	0.36	0.64	97.1–180.0	97.1–181.0	0.46
Chlorine	1.23	0.39	1.93	0.34	1.46	69.2–120.0	69.2–119.0	0.45
Calcium	−1.00	0.007	0.007	0.024	0.024	1.50–11.25	1.50–11.34	1.14
Phosphorus	1.50	0.90	1.61	1.17	1.78	0.80–1.30	0.60–2.80	1.30