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Screening for Pompe disease using a rapid dried blood spot method: experience of a clinical diagnostic laboratory.
Muscle & Nerve 2009 July
Pompe disease (acid maltase deficiency; glycogen storage disease type II) is caused by deficiency of the lysosomal enzyme acid alpha-glucosidase (GAA). Our clinical laboratory began to offer a fluorometric dried blood spot (DBS)-based GAA activity assay for Pompe disease in 2006 after the FDA approved GAA enzyme replacement therapy in April of that year. The purpose of this study was to examine the experience of our clinical laboratory in using this assay. Over a 2-year period, we received samples for the DBS GAA assay from 891 patients referred for possible Pompe disease, of whom 111 (12.5%) patients across the disease spectrum who had results in the affected range. The majority of the patients were referred by neurologists and geneticists. When available, we correlated the results obtained through DBS GAA activity assay with the results from a second DBS, or a second tissue (cultured skin fibroblasts or muscle biopsy). In our experience, the DBS GAA activity assay provides a robust, rapid, and reliable first tier test for screening patients suspected of having Pompe disease.
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