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Measurement of cystatin C in capillary blood samples in pediatric patients

Arend W van Deutekom1, Berndt Zur, Joanna A E van Wijk

  • 1Department of Pediatrics, VU University Medical Center, Amsterdam, The Netherlands, De Boelelaan 1117, 1081 HV, The Netherlands.

Clinical Biochemistry
|October 7, 2009
PubMed

Insights

Measuring cystatin C in capillary blood for children with kidney disease is unreliable. Capillary blood estimates of glomerular filtration rate (GFR) were higher than venous blood, limiting clinical use.

Area of Science:

  • Pediatric Nephrology
  • Biomarker Analysis
  • Renal Function Assessment

Background:

  • Glomerular filtration rate (GFR) is a key indicator of kidney function.
  • Cystatin C is a promising endogenous marker for estimating GFR.
  • Reliable GFR measurement in children is crucial for managing renal disease.

Purpose of the Study:

  • To evaluate the reliability of measuring cystatin C in capillary blood samples from pediatric patients with renal disease.
  • To compare GFR estimates derived from capillary versus venous cystatin C measurements.

Main Methods:

  • Simultaneous collection of venous and capillary blood samples from 48 children with renal disease.
  • Measurement of cystatin C concentrations in both sample types.
  • Estimation of GFR using the Filler equation based on both venous and capillary cystatin C levels.

Main Results:

  • Estimated GFR calculated from capillary cystatin C was significantly higher than that from venous cystatin C.
  • The limits of agreement between capillary and venous GFR estimates exceeded +/-20% at the upper reference concentration.
  • Discrepancies suggest potential unreliability of capillary blood for accurate GFR assessment in this population.

Conclusions:

  • Capillary blood sampling for cystatin C measurement in children with renal disease shows limited clinical utility due to significant variability.
  • Venous blood sampling remains the preferred method for reliable GFR estimation using cystatin C in pediatric nephrology.
  • Further research may be needed to refine capillary methods or explore alternative biomarkers for pediatric GFR assessment.

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