Osteopathia striata with cranial sclerosis, associated with juvenile idiopathic arthritis: A case report and review of literature

Table 2 Enzyme activity in the differential diagnosis of lysosomal storage disorders

Enzyme (associated disorder)	Activity (μmol/L/hour)	Reference range (μmol/L/hour)
N-acetyl-α-D-glucosaminidase (MPS IIIB)	5.41	1-20
Acetylgalactosamine-6-sulfatase (MPS IVA)	1.83	0.5-10
Arylsulfatase B (MPS VI)	2.95	1-15
β-D-galactosidase (GM1 gangliosidosis, MPS IVB)	8.57	2-30
β-D-glucuronidase (MPS VII)	33.69	10-65
Iduronate-2-sulfatase (MPS II)	16.31	10-50
Tripeptidyl peptidase 1 (neuronal ceroid lipofuscinosis type 2, CLN2)	58.05	15-85

MPS: Mucopolysaccharidosis.