Table 2.
Accuracy study using DEQAS samples.
| Target (ng/mL) | DiaSorin |
Elecsys |
Lumipulse |
||||
|---|---|---|---|---|---|---|---|
| 25(OH)D (ng/mL) | Bias (%) | 25(OH)D (ng/mL) | Bias (%) | 25(OH)D (ng/mL) | Bias (%) | ||
| DEQAS 561 | 26.6 | 29.2 | 9.8 | 30.0 | 12.8 | 22.1 | −16.9 |
| DEQAS 562 | 19.2 | 21.0 | 9.6 | 19.6 | 2.5 | 13.6 | −29.0 |
| DEQAS 563 | 35.5 | 34.9 | −1.7 | 41.2 | 16.0 | 31.1 | −12.7 |
| DEQAS 564 | 17.4 | 19.4 | 11.8 | 18.8 | 8.3 | 13.3 | −23.8 |
| DEQAS 565 | 30.5 | 35.1 | 15.1 | 30.8 | 0.9 | 26.4 | −13.5 |
| DEQAS 566 | 27.4 | 25.2 | −7.9 | 30.4 | 11.0 | 22.7 | −16.9 |
| DEQAS 567 | 26.8 | 25.6 | −4.6 | 30.8 | 15.0 | 23.3 | −13.1 |
| DEQAS 568 | 12.7 | 12.6 | −0.6 | 15.8 | 24.9 | 9.2 | −27.0 |
| DEQAS 569 | 33.0 | 35.0 | 5.9 | 38.4 | 16.2 | 29.8 | −9.8 |
| DEQAS 570 | 54.0 | 54.8 | 1.5 | 65.6 | 21.5 | 50.3 | −6.8 |
| Mean | 3.9 | 12.9 | −16.9 | ||||
| SD | 7.6 | 7.6 | 7.4 | ||||
DEQAS, Vitamin D External Quality Assurance Scheme, bias (%) = [(method – target)/target] x 100. Samples 561–565 belong to the DEQAS October 2019 exercise and samples 566–570 were from the DEQAS January 2020 exercise.