Establishment and Verification of Sex- and Age-Specific Serum Electrolyte Reference Intervals in Healthy Han Children in Changchun, Northeastern China
Table 4
Validation of electrolyte reference intervals in five laboratories in Changchun.
Analytes
Age group
Sex group
Reference intervals
Na
Lab 1
Lab 2
Lab 3
Lab 4
Lab 5
nb
Resultc
nb
Resultc
nb
Resultc
nb
Resultc
nb
Resultc
Potassium (mmol/L)
2 to < 4 years
F + M
3.96–5.39
20
0
100
0
100
1
95
1
95
2
90
4 to < 12 years
F + M
3.73–5.27
20
0
100
0
100
2
90
1
95
1
95
12 to < 15 years
F + M
4.14–5.39
20
0
100
1
95
0
100
1
95
0
100
Sodium (mmol/L)
2 to < 9 years
F + M
136.4–146.8
20
0
100
2
90
1
95
2
90
1
95
9 to < 11 years
F + M
121.8–146.4
20
0
100
1
95
2
90
1
95
2
90
11 to < 13 years
F + M
136.9–148.6
20
0
100
0
100
1
95
1
95
0
100
13 to < 15 years
F
134.5–146.4
20
2
90
1
95
2
90
1
95
0
100
M
138.6–149.2
20
1
95
1
95
1
95
0
100
1
95
Chlorine (U/L)
2 to < 11 years
F + M
94.6–106.4
20
0
100
0
100
1
95
0
100
0
100
11 to < 13 years
F + M
98.4–108.8
20
0
100
1
95
0
100
1
95
1
95
13 to < 15 years
F
93.9–107.4
20
1
95
1
95
0
100
0
100
1
95
M
97.1–107.5
20
0
100
0
100
1
95
1
95
1
95
Calcium (mmol/L)
2 years
F + M
2.00–2.64
20
0
100
1
95
0
100
1
95
0
100
3 to < 13 years
F + M
1.95–2.57
20
0
100
1
95
1
95
0
100
1
95
13 to < 15 years
F
1.96–2.32
20
2
90
1
95
1
95
1
95
0
100
M
1.96–2.37
20
1
95
0
100
1
95
0
100
1
95
Phosphorus (mmol/L)
2 years
F + M
1.39–2.65
20
0
100
0
100
1
95
1
95
0
100
3 to < 8 years
F + M
1.32–2.03
20
0
100
1
95
1
95
1
95
0
100
8 to < 11 years
F + M
1.26–1.89
20
0
100
1
95
0
100
0
100
1
95
11 to < 13 years
F + M
1.29–1.91
20
0
100
1
95
1
95
1
95
0
100
13 to < 15 years
F
1.10–1.61
20
1
95
0
100
1
95
0
100
2
90
M
1.00–1.99
20
0
100
1
95
0
100
1
95
1
95
M, male; F, female. aNumber of validation samples of this study. bNumber of validation samples outside the reference intervals of this study. cThe results of percentage of validation samples inside the reference intervals of this study.
