Is a urinary calcium-to-creatinine ratio of 0.117 normal for a 7-year-old child?

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Last updated: November 4, 2026 • View editorial policy

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A urinary calcium-to-creatinine ratio of 0.117 mg/mg in a 7-year-old child is within normal limits and does not indicate hypercalciuria.

Normal Reference Values for 7-Year-Olds

The calcium/creatinine ratio of 0.117 mg/mg falls well below established thresholds for hypercalciuria in this age group. Multiple population-based studies provide consistent reference ranges:

  • The most recent study from India (2026) found mean values of 0.12 ± 0.08 mg/mg at age 7, with a normal reference range up to 0.192 mg/mg 1
  • North American data shows the 95th percentile for Caucasian children aged 7-16 years is 0.20 mg/mg 2
  • Turkish children aged 7-14 years have a 95th percentile of 0.24 mg/mg 3
  • Iranian children aged 7+ years stabilize at approximately 0.038 ± 0.044 mg/mg mean values 4

Age-Related Context

The calcium/creatinine ratio shows a strong inverse relationship with age, with younger children demonstrating higher values that progressively decline through childhood 1, 5, 2. By age 7, values have typically stabilized to lower ranges compared to infants and toddlers.

Clinical Interpretation Guidelines

For monitoring purposes in various pediatric conditions, the following thresholds apply:

  • X-linked hypophosphatemia (XLH): Upper normal ranges are 0.8 mol/mol (approximately 0.28 mg/mg) for ages 5-7 years and 0.7 mol/mol (approximately 0.25 mg/mg) for ages >7 years 6, 7
  • Williams syndrome: Spot urine calcium/creatinine ratio should be obtained if hypercalcemia is present 8
  • General hypercalciuria screening: Most guidelines use 0.20-0.24 mg/mg as the upper limit of normal for school-age children 2, 3

Important Caveats

Several factors can affect the calcium/creatinine ratio:

  • Timing of collection: First morning void samples are preferred and typically show lower values than random samples 9, 10
  • Fasting status: Non-fasting samples may show higher values 1, 4
  • Dietary sodium intake: While some studies in hypercalciuric children suggest a relationship between sodium and calcium excretion, this correlation is not significant in healthy children 2
  • Geographic and ethnic variation: Population-specific reference values should be considered, though your child's value falls within normal ranges across multiple populations 5, 4, 2, 3

Clinical Recommendation

No further evaluation for hypercalciuria is needed based on this single value of 0.117 mg/mg. This ratio is approximately at the mean for age 7 and well below all established upper limits. If there were clinical concerns (recurrent kidney stones, bone disease, or specific genetic conditions), repeat testing with a first morning void sample would be appropriate, but the current value provides reassurance of normal calcium excretion 6, 7.

References

4
Research

Urinary mineral excretion in healthy Iranian children.

Pediatric nephrology (Berlin, Germany), 2003

5
Research

Urinary calcium to creatinin ratio in children.

Indian journal of pediatrics, 2005

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