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.