Urolithiasis pp 529-530 | Cite as

Theme Poster Session: Chemical Analyses

  • G. A. Rose
  • M. H. Gault

Abstract

The results of three year’s experience of external quality assessment of urinary oxalate analysis from 60 departments was presented by Samuell et al. (p. 531). There was an unacceptably wide scatter between laboratories, with CV values usually exceeding 20%. The precipitation methods often gave poor precision and accuracy. Ascorbate gave positive interference with Sigma Kit procedure and sodium nitrite was found to be the preferred technique for ascorbate removal. The controversy about possible in vivo conversion of ascorbate to oxalate was discussed but not resolved. Oxalate methodology is not yet sufficiently advanced to assign a reference method. However, the automated immobilized oxalate oxidase technique presented by Liedtke et al. (p. 535) and the Dionex HPLC method as used by Wandzilak and Williams appear promising. Centralization of oxalate procedures may prove advantageous.

Keywords

Urinary Calcium Calcium Oxalate Sodium Nitrite External Quality Assessment Oxalate Oxidase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© Springer Science+Business Media New York 1989

Authors and Affiliations

  • G. A. Rose
    • 1
    • 2
  • M. H. Gault
    • 1
    • 2
  1. 1.St. Peter’s Hospital and Institute of UrologyLondonUK
  2. 2.Memorial UniversitySt. John’sCanada

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