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Urinary glycosaminoglycan excretion in urolithiasis
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Editor,—Akçay et alreported urinary glycosaminoglycan (GAG) excretion to be significantly diminished in children with idiopathic urolithiasis compared with controls, and proposed that urinary GAG may play an important role in the prevention and reduction of calculi in children.1 Our findings do not fully support this hypothesis.2 We evaluated urinary GAG excretion in 22 children with calcium oxalate stones (eight with absorptive hypercalciuria, six with renal hypercalciuria, eight with normocalciuria) and in 20 age …