Evaluation of a New Generation Automated Assay for 25-Hydroxy Vitamin D Based on Competitive Protein Binding
| Autor: | Edward Ki Yun Leung, Maryam Asif, Kiang-Teck J. Yeo, Xander M R van Wijk, Sarah E Groboske |
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| Rok vydání: | 2019 |
| Předmět: |
Immunoassay
Vitamin D metabolism Chromatography Medical device Chemistry General Medicine 030204 cardiovascular system & hematology Binding Competitive High-Throughput Screening Assays Mostly good 03 medical and health sciences Deming regression 0302 clinical medicine Tandem Mass Spectrometry Vitamin D and neurology Humans Sample Type False Positive Reactions Reagent Kits Diagnostic 030212 general & internal medicine Vitamin D Chromatography High Pressure Liquid Protein Binding |
| Zdroj: | The Journal of Applied Laboratory Medicine. 4:247-253 |
| ISSN: | 2475-7241 2576-9456 |
| DOI: | 10.1373/jalm.2018.028415 |
| Popis: | Background The interest for vitamin D has exponentially increased testing demand for 25-hydroxy vitamin D [25(OH)D]. Consequently, many laboratories are switching from LC-MS/MS methods to automated, high-throughput immunoassays. One of the major potential issues with these assays has been the lack of cross-reactivity with 25(OH)D2. Methods We have evaluated the Roche Elecsys vitamin D total II assay for accuracy by comparing 79 patient samples with LC-MS/MS. The cross-reactivity for 25(OH)D2 was evaluated by analyzing samples with high 25(OH)D2 separately and estimating 25(OH)D2 recovery, as well as by spiking of 25(OH)D2. The assay was further evaluated for precision, linearity, sample type, and common interferences. Results There was mostly good agreement between the Elecsys and LC-MS/MS assays (Deming regression: y = 0.95x + 0.70), with an overall bias of 2.3% (−0.84 ng/mL). However, there were 6 out of 79 (7.6%) discordant samples. The Deming regression for samples with high 25(OH)D2 compared to LC-MS/MS showed similar slope and intercept (y = 0.97x − 1.1). The average recovery of 25(OH)D2 for these samples was 90%. The initial precision studies were in general agreement with the package insert, but long-term clinical use showed higher-than-claimed imprecision (11.7%–14.4% at 12 ng/mL and 6.9%–7.6% at 27 ng/mL; claimed: 7.2% and 5.0%, respectively). We observed 1 falsely high result in plasma, an issue previously addressed by Roche in a medical device correction. Conclusions The analytical performance of the Roche Vitamin D assay was acceptable, and the assay had a good cross-reactivity for 25(OH)D2. |
| Databáze: | OpenAIRE |
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