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- W2126203572 abstract "The health and sight of millions of children are compromised each year as a consequence of vitamin A (VA) deficiency. Serum retinol is the most commonly used indicator of VA status. Unfortunately, its use is impractical for national surveys because it involves collection of venous blood, centrifugation and frozen storage before analysis. To make VA assessment more practical, we have developed approaches incorporating dried blood spots (DBS) or portable instrumentation. DBS have been used as a sample matrix to screen neonates for many biochemical compounds. Until recently, it was not thought that VA was stable in DBS. However, we demonstrated that the measure of DBS retinol correlates well with serum retinol in both healthy adults (r2 = 0.88–0.90) and compromised populations (r2 = 0.73–0.84). Compared with serum retinol, the sensitivity and specificity of detecting VA deficiency by DBS retinol range from 73 to 93% and from 90 to 100%, respectively. Although few data are available, retinol binding protein (RBP) can also be measured in DBS. RBP has been used as a surrogate marker for serum retinol. Correlations coefficients (r2) between serum RBP and serum retinol range from 0.4 to 0.8. In addition, work has been done to develop portable instrumentation to measure VA status in the field. A fluorometer has been optimized for VA fluorescence and is linear into the deficient range for the direct fluorimetric measurement of serum holo-RBP. Progress is being made to use the instrument to directly measure holo-RBP in a drop of whole blood." @default.
- W2126203572 created "2016-06-24" @default.
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- W2126203572 date "2001-05-01" @default.
- W2126203572 modified "2023-10-11" @default.
- W2126203572 title "Innovative Approaches to Vitamin A Assessment" @default.
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- W2126203572 doi "https://doi.org/10.1093/jn/131.5.1626s" @default.
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