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17.05.2018 | Original Article

Combining GFR estimates from cystatin C and creatinine—what is the optimal mix?

verfasst von: Emil den Bakker, Reinoud Gemke, Joanna A. E. van Wijk, Isabelle Hubeek, Birgit Stoffel-Wagner, Arend Bökenkamp

Erschienen in: Pediatric Nephrology | Ausgabe 9/2018

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Abstract

Background

Combining estimated glomerular filtration rate (eGFR) equations based on creatinine and cystatin C has been shown to improve the accuracy of GFR estimation. This study aims to optimize this strategy for height-independent GFR estimation in children.

Methods

Retrospective study of 408 inulin clearance tests with simultaneous International Federation of Clinical Chemistry-calibrated measurements of creatinine, cystatin C, and urea in children (mean age 12.5 years, GFR 91.2 ml/min/1.73m²) comparing the arithmetic (mean_arith) and geometric means (mean_geom) of a height-independent creatinine-based (full age spectrum, based on age (FASage)) and a cystatin C-based equation (FAScys), with the complex height-dependent CKiD3 equation incorporating gender, height, cystatin C, creatinine, and urea.

Results

Mean_geom had a P₃₀ accuracy of 89.2% compared to mean_arith 87.7% (p = 0.030) as well as lower bias and %precision error and performed almost as well as CKiD3 (P₃₀ accuracy 90.9%). Modifying the weight of FASage and FAScys when calculating the means showed that an equal contribution was most accurate in most patients. In spina bifida patients, FAScys alone outperformed any combination. Malignancy or nephritis patients had slightly higher accuracy with weighted means favoring cystatin C or creatinine, respectively. Disagreement between FAScys and FASage was inversely correlated with the accuracy of mean_geom. When disagreement exceeded 40%, application of weighted means based on diagnosis improved the performance of eGFR.

Conclusions

In the absence of height data, the optimal strategy for estimating GFR in children is by using the geometric mean of FASage and FAScys. When there is large disagreement between the two, weighted means based on diagnosis improve accuracy.

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Titel: Combining GFR estimates from cystatin C and creatinine—what is the optimal mix?
verfasst von: Emil den Bakker
Reinoud Gemke
Joanna A. E. van Wijk
Isabelle Hubeek
Birgit Stoffel-Wagner
Arend Bökenkamp
Publikationsdatum: 17.05.2018
Verlag: Springer Berlin Heidelberg
Erschienen in: Pediatric Nephrology / Ausgabe 9/2018
Print ISSN: 0931-041X
Elektronische ISSN: 1432-198X
DOI: https://doi.org/10.1007/s00467-018-3973-8

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Combining GFR estimates from cystatin C and creatinine—what is the optimal mix?