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Table 4 Assignment of quality control materials

From: Determination of serum 25-hydroxyvitamin D status among population in southern China by a high accuracy LC-MS/MS method traced to reference measurement procedure

 

25(OH)D3

25(OH)D2

Values(\( {\overline{x}}_i \) ±Si ng/mL)

CV(%)

Values(\( {\overline{x}}_i \) ±Si ng/mL)

CV(%)

QC-low

28.14 ± 0.99

3.52

0.48 ± 0.02

4.82

QC-medium

34.65 ± 1.14

3.28

5.15 ± 0.22

4.31

QC-high

44.38 ± 1.29

2.91

11.44 ± 0.30

2.64

  1. QC quality control, \( {\overline{x}}_i \) median, Si standard deviation, CV variable coefficient