QI	Quality Improvement
NBS	Newborn Screening
RUSP	Recommended Uniform Screening Panel
X-ALD	X-linked adrenal leukodystrophy
PD	Pompe disease
MPS I	Mucopolysaccharidosis type I
GAA	$\alpha$-glucosidase
IDUA	$\alpha$-L-iduronidase
PPV	Positive Predictive Value
GAGs	Glycosaminoglycans
CLIR	Collaborative Laboratory Integrated Reports
MoM	Multiples of the Median
QC	Quality Control
PT	Proficiency Testing
DMF	Digital Microfluidics
MS/MS	Tandem Mass Spectrometry
LD	Lysosomal Disorders
NSQAP	Newborn Screening Quality Assurance Program
CDC	Centers for Disease Control and Prevention
NewSTEPs	Newborn Screening Technical Assistance and Evaluation Program
CCR	Consumer Contracted Reagents
PE	Perkin Elmer Wallac, INC.
FIA	Flow Injection Analysis
UPLC	Ultra-high-Performance Liquid Chromatography
r2	Coefficient of determination
GALC	Galactocerebrosidase
QCBP	QC base pool