Journal List > Lab Med Online > v.7(3) > 1057344

Yang and Hwang: Comparison of Three Commercially Available Assays for Measurement of Vitamin D

Abstract

Background

We evaluated three commercially available vitamin D assays to evaluate and compare the correlation and accuracy among them.

Methods

Vitamin D was measured in 71 patient samples using the Architect 25-OH vitamin D assay (Abbott), the ADVIA Centaur vitamin D total assay (Siemens), and the LIAISON 25 OH vitamin D total assay (Diasorin). The evaluation made use of both patient samples and standard reference material, SRM 972. To analyze correlations and differences, Pearson's correlation coefficients and paired sample t-tests were performed.

Results

Correlations among the three evaluated assays showed strong positive linear relationships (correlations among Siemens and DiaSorin, DiaSorin and Abbott, Abbott and Siemens: r=0.935, r=0.927, r=0.909, respectively). Mean (SD) vitamin D values on Siemens, Abbott, and DiaSorin assays in the 71 patient samples were 23.09 (10.41), 16.75 (11.26), and 16.76 (9.32), respectively. Results for the Siemens assay were significantly different from the other two methods (P<0.001). Target values for SRM 972 level 1, 2, 3, and 4 were 23.9, 14.0, 44.9, and 35.4, respectively. The Abbott, Siemens, and Diasorin assay values were closest to the target values in level 1, levels 2 and 3, and level 4, respectively.

Conclusions

Correlations among vitamin D assays were good; however, the mean values of the Siemens assay were significantly higher than those of DiaSorin or Abbott. We found significant differences in vitamin D levels and discrepancies between patient samples and SRM 972 samples, which should be considered during use in a clinical setting.

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Fig. 1.
Linear regression and Bland-Altman analyses of immunoassays. (A) and (B), Abbott and DiaSorin; (C) and (D), DiaSorin and Siemens; and (E) and (F), Abbott and Siemens. Abbreviations: Abbott, Architect 25-OH vitamin D assay of Abbott; DiaSorin, LIAISON 25 OH vitamin D total assay of DiaSorin; Siemens, ADVIA Centaur vitamin D total assay of Siemens.
lmo-7-120f1.tif
Fig. 2.
Distribution of vitamin D levels of all samples by Siemens, Abbott, and DiaSorin. The mean (SD) of Siemens, Abbott, and DiaSorin assays was 23.09 (10.41), 16.75 (11.26), and 16.76 (9.32), respectively. Siemens (■), Abbott (▲), and DiaSorin (♦) indicate the ADVIA Centaur vitamin D total assay of Siemens, the Architect 25-OH vitamin D assay of Abbott, and the LIAISON 25 OH vitamin D total assay of DiaSorin, respectively.
lmo-7-120f2.tif
Fig. 3.
Measured values relative to target values for vitamin D. Target values for SRM 972 levels 1, 2, 3, and 4 were 23.9, 14.0, 44.9, and 35.4, respectively. Siemens (■), Abbott (■), and DiaSorin (■) indicate the ADVIA Centaur vitamin D total assay of Siemens, the Architect 25-OH vitamin D assay of Abbott, and the LIAISON 25 OH vitamin D total assay of DiaSorin, respectively.
lmo-7-120f3.tif
Table 1.
Paired sample t-tests among Siemens, Abbott, and DiaSorin vitamin D assays
Paired group Mean SD 95% Confidence Interval P-value
Lower Upper
DiaSorin – Abbott 0.00704 4.36700 -1.02661 1.04069 0.989
DiaSorin – Siemens -6.33577 3.70147 -7.21190 -5.45965 <0.001
Abbott – Siemens -6.34282 4.70884 -7.45738 -5.22825 <0.001

The difference between the paired assays is smaller between DiaSorin and Abbott compared to that between Siemens and each of the other two assays, and the DiaSorin – Abbott difference is not significant. In contrast, the differences between DiaSorin and Siemens and between Abbott and Siemens assays were significant.

Table 2.
Accuracy of the DiaSorin, Abbott, and Siemens vitamin D assays
SRM 972 (Target value) Siemens Abbott DiaSorin
Level 1 (23.9) Mean (ng/mL) 14.94 19.17 17.67
  SD 1.46 0.55 0.42
  CV (%) 9.76 2.87 2.36
Level 2 (14.0) Mean (ng/mL) 14.33 14.43 17.50
  SD 1.69 0.12 1.25
  CV (%) 11.76 0.80 7.16
Level 3 (44.9) Mean (ng/mL) 40.66 20.33 27.40
  SD 2.20 0.45 0.17
  CV (%) 5.40 2.22 0.63
Level 4 (35.4) Mean (ng/mL) 21.24 23.97 29.30
  SD 1.67 0.42 0.40
  CV (%) 7.88 1.74 1.37

Siemens, Abbott, and DiaSorin in the table indicate the ADVIA Centaur vitamin D total assay of Siemens, the Architect 25-OH vitamin D assay of Abbott, and the LIAISON 25 OH vitamin D total assay of DiaSorin, respectively.

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