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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