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- W2031754927 abstract "Homocystinuria is an autosomal recessive disorder usually caused by deficiency of cystathionine β-synthase, leading to grossly increased plasma and urine concentrations of homocysteine. There is considerable evidence that early detection and treatment can prevent the clinical consequences of the enzyme deficiency (1)(2); therefore, screening for the disorder has been advocated (1). Many cases of homocystinuria have secondary hypermethioninemia. Neonatal screening for homocystinuria by measurement of increased methionine concentrations in dried blood spots (DBS) has been performed in some centers but has poor sensitivity. Approximately 20% of cases are missed, partly because of low methionine concentrations in breast milk and some infant formulas (3). The measurement of homocysteine in DBS has not been used as a screen for homocystinuria, partly because of uncertainty about the suitability of DBS samples. Homocysteine concentrations are unstable in whole blood stored at room temperature and increase by ∼1.0 μmol/L per hour (4). This is attributable to in vitro erythrocyte transmethylation reactions that lead to continuous production and release of homocysteine (5). It is not known whether homocysteine is released from erythrocytes in blood that has been spotted on filter paper and dried, either during the spotting and drying process or during storage at room temperature. A recent report assessed stability in screening cards that were stored at 4 °C, which does not reflect routine practice (6). Another investigated the stability of DBS samples, using whole blood to which large concentrations of aqueous homocysteine calibrator had been added, thus potentially masking any increase in homocysteine attributable to release from erythrocytes (7). The lack of information on the stability …" @default.
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- W2031754927 date "2005-01-01" @default.
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- W2031754927 title "Blood Spot Homocysteine: A Feasibility and Stability Study" @default.
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- W2031754927 doi "https://doi.org/10.1373/clinchem.2004.041640" @default.
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