Table 6.

Reference Intervals of K, Na, and Cl in Adult Healthy Chinese Han Population in Six Different Cities in China

		K (mmol/l)		Na (mmol/l)		CL (mmol/l)
Area	No.	Mean ± SD	2.5–97.5th	Mean ± SD	2.5–97.5th	Mean ± SD	2.5–97.5th
Shenyang (Lab 1)	739	4.4 ± 0.4	3.7–5.3	142±2	138–147	105 ± 3	99–110
Beijing (Lab 2)	674	4.3 ± 0.4	3.6–5.1	140 ± 3	134–144	103 ± 2	99–107
Shanghai (Lab 3)	623	4.2 ± 0.3	3.6–5.0	141 ± 2	137–146	104 ± 2	98–108
Guangzhou (Lab 4)	1,011	4.3 ± 0.4	3.7–5.4	141 ± 2	137–145	104 ± 2	100–108
Chengdu (Lab 5)	728	4.2 ± 0.4	3.6–5.0	143 ± 2	139–148	106 ± 3	101–111
Xi'an (Lab 6)	749	4.4 ± 0.4	3.6–5.3	141 ± 3	133–147	103 ± 3	98–110
Combined	4,524	4.3 ± 0.4	3.6–5.2	141 ± 3	136–146	104 ± 3	99–110