Importance of the combined urinary procedure for the diagnosis of Mucopolysaccharidoses.

Background: Mucopolysaccharidoses are characterized by the accumulation of undegraded glycosaminoglycans in lysosomes in multiple organs and by their excretion in high amounts in urine. The aim of this study is to determine if this simple, reliable and reproducible method is useful for the diagnosis of Mucopolysaccharidoses.

Methods: The study included 2154 normal urine samples and 210 samples from 73 patients affected by different types of Mucopolysaccharidoses. The glycosaminoglycans were quantified by a dimethylmethylene blue method and size-fractionated by a modified one-dimensional electrophoresis method.

Results: The combination of the two methods allowed to identify all the patients affected by the different types of Mucopolysaccharidosis with 100% sensitivity and specificity.

Conclusion: This combined approach gives fast diagnostic orientation about the different types of Mucopolysaccharidoses, offering an important tool for a better understanding of diagnosis and patient management.