“…Several MPS-subtypes have specific enzyme replacement therapy available, and there are many indications that MPS patients treated at an early age do better than those treated later in life (Auclair et al, 2003;McGill et al, 2010;Gabrielli et al, 2010;Schulze-Frenking et al, 2011;Baldo et al, 2013;Poe et al, 2014;Muenzer J, 2014;Tomatsu et al, 2016). Newborn screening programs for MPSs using dried blood spots (DBS) were proposed in 2001 and highthroughput technologies such as tandem mass spectrometry (MS/MS) are now under investigation (Meikle et al, 2006;Gelb et al, 2006;Wolfe et al, 2011;de Ruijter et al, 2012;Spacil et al, 2013;Scott et al, 2013;Lin et al, 2013;Tomatsu et al, 2013;Shimada et al, 2014a;Liao et al, 2014;Gucciardi et al, 2014;Ruijter et al, 2014;Gelb et al, 2015;Hopkins et al, 2015). Methods currently under development include assays for activity of deficient enzymes (Gelb et al, 2015;Hopkins et al, 2015), measurement of accumulated GAGs (Oguma et al, 2007;Tomatsu et al, 2013;Lawrence et al, 2012Lawrence et al, , 2014.…”