title: Spherical calcium bodies in stone-forming urine.
abstract: Twenty-four hour urine specimens from 26 active stone formers and 15 non-stone formers were passed through an ultrafilter that retained all molecules with a molecular weight greater than 50,000. Microscopic spherical bodies that laked alizarin red were observed in the urinary ultrafiltrate from 24 of 26 active stone formers. Only three of 15 non-stone-forming control urines contained these bodies. Histochemical studies showed the presence of calcium, phosphorus, and carbohydrate-protein complexes. No crystalline elements were detected.
mesh_terms: D002118:Calcium / Q000652:urine*; D002241:Carbohydrates / Q000652:urine; D003102:Colloids / Q000652:urine; D006801:Humans; D010070:Oxalates / Q000652:urine; D010758:Phosphorus / Q000652:urine; D014462:Ultrafiltration; D014545:Urinary Calculi / Q000652:urine*
chemical_list: D002241:Carbohydrates; D003102:Colloids; D010070:Oxalates; D010758:Phosphorus; D002118:Calcium