Calcium Kidney Stones

  title={Calcium Kidney Stones},
  author={Elaine M. Worcester and Fredric L. Coe},
Copyright © 2010 Massachusetts Medical Society. A 43-year-old man presents for evaluation of recurrent kidney stones. He passed his first stone 9 years earlier and has had two additional symptomatic stones. Analysis of the first and the last stones showed that they contained 80% calcium oxalate and 20% calcium phosphate. Analysis of a 24-hour urine collection while the patient was not receiving medications revealed a calcium level of 408 mg (10.2 mmol), an oxalate level of 33 mg (367 μmol), and… CONTINUE READING