Clinical Chemistry
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Clinical Chemistry 33: 1118-1120, 1987;
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Clinical Chemistry, Vol 33, 1118-1120, Copyright © 1987 by American Association for Clinical Chemistry

Two-carbon oxalogenesis compared in recurrent calcium oxalate stone formers and normal subjects

BC McWhinney, SL Nagel, DM Cowley, JM Brown and AH Chalmers

We used a xylitol load to test the two-carbon pathway to oxalate production in humans. Use of this pentose sugar caused a fourfold increase in glycolate excretion, indicating its suitability as a dynamic function test of two-carbon metabolism. However, despite this increase in glycolate excretion in 10 recurrent stone formers and six normal subjects, there was no concomitant increase in oxalate excretion in either group. By comparison, a sucrose load produced no increase in excretion of either glycolate or oxalate. In addition, when we studied four recurrent calcium stone formers on successive diets with various fat content, we found no correlation between high fat intake and increased glycolate or oxalate excretion. In summary, there was no evidence of abnormal fluxes through the two-carbon pathway to oxalate in recurrent stone formers, nor of hyperoxaluria as related to increased intake of sucrose or fat.


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Copyright © 1987 by the American Association for Clinical Chemistry.