Pediatric Nephrology

, Volume 9, Issue 1, pp 39–44 | Cite as

Urinary calcium and oxalate excretion in children

  • György S. Reusz
  • Mariann Dobos
  • Dennis Byrd
  • Péter Sallay
  • Miklós Miltényi
  • Tivadar Tulassay
Original Article


We have established normal values for calcium/creatinine (Ca/Cr) and oxalate/creatinine (Ox/Cr) ratios in 25 infants (aged 1–7 days) and 391 children (aged 1 month to 14.5 years) and compared these with values obtained in 137 children with post-glomerular haematuria and 27 with nephrolithiasis. Oxalate was measured by ion chromatography. Nomograms of Marshall and Robertson were used to calculate urine saturation to calcium oxalate. The Ca/Cr ratio was normally distributed whereas the Ox/Cr ratio had a log-normal distribution. The molar ratio of Ca/Cr was the lowest in the first days of life and the highest between 7 month and 1.5 years (mean±SD=0.39±0.28 mmol/mmol). Following a slight decrease it stabilised by the age of 6 years (0.34±0.19 mmol/mmol). The highest Ox/Cr values were measured during the 1st month of life [geometric mean 133 (range 61–280) μmol/mmol], followed by a gradual decrease until 11 years of age [mean 24 (range 6–82) μmol/mmol]. Thirty-six haematuric children had hypercalciuria (26%), 23 had absorptive hypercalciuria, 13 renal type. Children with absorptive hypercalciuria on a calcium-restricted diet had significantly higher oxalate excretion than those with renal hypercalciuria and the control group [38 (range 28–49) vs. 22 (range 16–29) and 23 (range 22–27) μmol/mol respectively,P<0.01]. Calcium oxalate urine saturation of stone patients was higher than that of patients with haematuria and the normal population (1.18±0.05 vs. 1.06±0.03,P<0.03 and 0.84±0.03,P<0.001 respectively). The measurement of Ca/Cr and Ox/Cr in first-morning urine samples is suitable for screening for hypercalciuria and hyperoxaluria. Interpretation of the values requires age-specific reference values. Both calcium and oxalate determinations should be part of the evaluation of patients with haematuria, hypercalciuria or nephrolithiasis.

Key words

Calcium Oxalate Normal values Nephrolithiasis 


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Copyright information

© IPNA 1995

Authors and Affiliations

  • György S. Reusz
    • 1
  • Mariann Dobos
    • 1
  • Dennis Byrd
    • 2
  • Péter Sallay
    • 1
  • Miklós Miltényi
    • 1
  • Tivadar Tulassay
    • 1
  1. 1.First Department of PaediatricsSemmelweis University Medical SchoolBudapestHungary
  2. 2.Laboratory of Paediatric Nephrology and Metabolic DiseasesMedical SchoolHannoverGermany

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