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Pediatric Nephrology

, Volume 11, Issue 2, pp 186–188 | Cite as

Urinary calcium excretion in healthy school children

  • Laura F. Alconcher
  • Cecilia Castro
  • Daniel Quintana
  • Nancy Abt
  • Luis Moran
  • Laura Gonzalez
  • Mabel Cella
  • Mabel Torelli
Original article

Abstract.

Two hundred and twenty Argentinian primary school children (122 boys, 98 girls, aged 6 – 13 years) were studied to establish reference values of 24-h urinary calcium excretion (UCa) and calcium/creatinine ratio (Ca/Cr) in 24-h urine collections and in first-morning urine samples. Mean UCa excretion was 2.05±1.40 mg/kg per day and the 95th percentile was 4.74 mg/kg per day. UCa excretion was higher in boys than girls (2.33±1.47 and 1.70±1.24 mg/kg per day respectively, P <0.001). Statistically significant differences were found between the 6- to 9-year and the 10- to 13-year age groups (2.37±1.49 vs. 1.73±1.25 mg/kg per day, P <0.001). Mean Ca/Cr ratios in 24-h collections and in first-morning urine samples were 0.129±0.086 and 0.105±0.079 for the group overall (P <0.001). The Ca/Cr ratio in the first-morning urine sample correlated poorly with the 24-h calcium excretion, suggesting that the Ca/Cr ratio in first-morning urine samples cannot replace the 24-h measurement.

Key words: Urinary calcium Creatinine Sodium 

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Copyright information

© IPNA - International Pediatric Nephrology Association New York, USA 1997

Authors and Affiliations

  • Laura F. Alconcher
    • 1
  • Cecilia Castro
    • 2
  • Daniel Quintana
    • 2
  • Nancy Abt
    • 2
  • Luis Moran
    • 3
  • Laura Gonzalez
    • 3
  • Mabel Cella
    • 3
  • Mabel Torelli
    • 3
  1. 1.Pediatric Nephrology Unit, Penna Hospital, Bahia Blanca, Buenos Aires, ArgentinaAR
  2. 2.Department of Pediatrics, Penna Hospital, Bahia Blanca, Buenos Aires, ArgentinaAR
  3. 3.Department of Biochemistry, Penna Hospital, Bahia Blanca, Buenos Aires, ArgentinaAR

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