title: [Types of kidney calculi. Relationship with urinary biochemistry].
abstract: OBJECTIVE
  To present a simple classification of the most frequent renal calculi that relates each type of calculus with the main possible etiologic factors linked to its formation (mainly urinary biochemical parameters).
  
  
  METHODS
  The macro, microstructure and composition of 2,500 renal calculi were studied by appropriate combination of stereoscopic microscopy, IR spectroscopy and scanning electron microscopy + X-ray microanalysis. The information obtained were related with the main urinary biochemical parameters, determined by conventional analytical procedures.
  
  
  RESULTS
  Ten main categories of renal stones, covering over 95% of all conceivable calculi, are distinguished based on their composition and structure. Etiologic factors, mainly urinary biochemical parameters, leading to the formation of stone of every category are specified.
  
  
  CONCLUSIONS
  From the detailed study of the renal calculus important etiologic factors can be deduced. Such information complements and confirms the urinary biochemical studies. As a consequence, the corresponding treatment can be better established.
authors.affiliation: Laboratorio de Investigación en Litiasis Renal, Facultad de Ciencias, Universidad de las Islas Baleares, Palma de Mallorca. dqufgf0@ps.uib.es
authors.forename: F
authors.initials: F
authors.lastname: Grases Freixedas
authors.forename: A
authors.initials: A
authors.lastname: Conte Visús
authors.forename: A
authors.initials: A
authors.lastname: Costa-Bauzá
authors.forename: M
authors.initials: M
authors.lastname: Ramis Barceló
mesh_terms: D006801:Humans; D007669:Kidney Calculi / Q000737:chemistry / Q000145:classification*; D014551:Urinary Tract / Q000378:metabolism*