Pediatric Nephrology

, Volume 20, Issue 12, pp 1769–1775

Estimation of the glomerular filtration rate in children: which algorithm should be used?

  • Lyonne K. van Rossum
  • Ron A. A. Mathot
  • Karlien Cransberg
  • Robert Zietse
  • Arnold G. Vulto
Original Article

DOI: 10.1007/s00467-005-2001-y

Cite this article as:
van Rossum, L.K., Mathot, R.A.A., Cransberg, K. et al. Pediatr Nephrol (2005) 20: 1769. doi:10.1007/s00467-005-2001-y
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Abstract

Glomerular filtration rate (GFR) in children can be estimated by the formula GFR=k×BH/Pcr (where BH is body height in centimetres and Pcr is the plasma creatinine concentration in micromoles per litre). For k, several values have been reported: k=38 (Counahan), k=40 (Morris) and k=48.7 (Schwartz). In this study the predictive performance of these formulae was compared with that of newly developed formulae. GFR measurements based on inulin concentration time curves were divided into an index (n=58) and a validation data set (n=48). In the index data set a value for k was derived by application of nonlinear mixed-effect modelling. This approach was also used to develop a formula that better explained the relationship between patient factors and GFR. Bias and precision of all formulae were calculated for the validation data set. In the index data set a value of 41.2 was found for k, which was close to the value k=40 (Morris). Both formulae estimated GFR well (bias <5%; precision 25%). Further modelling of the relationship between patient factors and GFR did not improve the predictive performance. In our hospital GFR was best estimated by the formula with k=40 and k=41.2. It is recommended that the optimal value for k be assessed locally.

Keywords

GFRInulinFormulaCreatinineChildren

Copyright information

© IPNA 2005

Authors and Affiliations

  • Lyonne K. van Rossum
    • 1
  • Ron A. A. Mathot
    • 1
  • Karlien Cransberg
    • 2
  • Robert Zietse
    • 3
  • Arnold G. Vulto
    • 1
  1. 1.Department of Hospital PharmacyErasmus MCRotterdamThe Netherlands
  2. 2.Department of Paediatric NephrologyErasmus MC-SophiaRotterdamThe Netherlands
  3. 3.Department of Internal MedicineErasmus MCRotterdamThe Netherlands