Urolithiasis pp 417-420 | Cite as

Theme Poster Session: Oxalate

  • L. H. Smith
  • B. Baggio


Oxalate with calcium forms the most-common crystal salt in the majority of calculi formed within the urinary tract. These ions are present in an equal molar ratio in the crystals of calcium oxalate monohydrate and calcium oxalate dihydrate. The greatest crystalline mass from a solution supersaturated with calcium oxalate is made when these ions are present at equal molar concentrations. In normal urine, the ratio between the molar concentration of calcium and oxalate is usually greater than 3:1 and often 5:1 or greater. Thus, increases in the calcium concentration would be expected to have a lesser effect on supersaturation and crystalline mass than increases in the oxalate concentration, making oxalate concentration a major determinant in the formation of calcium oxalate stones within the urinary tract (1–3).


Calcium Oxalate Urinary Oxalate Oxalate Concentration Oxalate Excretion Primary Hyperoxaluria 
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Copyright information

© Springer Science+Business Media New York 1989

Authors and Affiliations

  • L. H. Smith
    • 1
    • 2
  • B. Baggio
    • 1
    • 2
  1. 1.Division of NephrologyMayo ClinicRochesterUSA
  2. 2.Institute of Internal Medicine, Division of NephrologyUniversity of PadovaPadovaItaly

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