Total Glycosaminoglycans (GAGs) Analysis

Test Information

Patients with mucopolysaccharide (MPS) storage disorders cannot break down specific glycosaminoglycans (GAGs) in the lysosome, which results in their accumulation in body tissues and their abnormal excretion in the urine. The presence of elevated concentrations of GAGs in a patient’s urine is a useful initial screening tool in making a diagnosis of an MPS disorder.

Turnaround Time

10 days

CPT Code(s)

83864

Cost

$150

Clinical Information

The mucopolysaccharidoses are a group of inherited lysosomal storage disorders, each with a distinctive phenotype and a progressive course due to a specific enzyme deficiency. These enzymes are involved in the degradation of specific glycosaminoglycans. This test includes quantitative measurement of total glycosaminoglycans as well as quantitation of the individual GAG components, including heparan sulfate, dermatan sulfate, chondroitin sulfate, and keratan sulfate.

Indications

A mucopolysaccharidosis may be considered in children with: developmental delay regression of acquired skills failure to thrive coarse facies hepatosplenomegaly corneal clouding stiff joints dysostosis multiplex

Methodology

1,9-dimethylene blue (DMB) colorimetric reaction that is measured by spectrophotometry.

Specimen Requirements

This analysis requires at least 3 ml of random catch urine.

Transport Instructions

The urine sample must be frozen, preferably on dry ice. If the sample can be delivered the same day, it may be sent cold or at room temperature. Samples must be sent frozen by overnight delivery services or courier.

Have Questions? Need Support?

Call our laboratory at 1-800-473-9411 or contact one of our Laboratory Genetic Counselors for assistance.
Robin Fletcher, MS, CGC
Falecia Thomas, MS, CGC

Meet Charlie

After a long three-year struggle trying to have children, our son, Charlie, was born on April 18, 2009. He was our miracle...perfect in every way! When Charlie was five days old, our pediatrician called to notify us that one of the numbers from the heel prick test was a bit high. We headed to the hospital that afternoon for more tests. I will never forget the following day. It was cool and crisp - not a cloud in the sky. The next thing I know, our ...

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