Validation of the CKiD formulae to estimate GFR in children post renal transplant

Khurrum Siddique, David Leonard, Leisa Borders, Mouin G. Seikaly

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Background: The Chronic Kidney Disease in Children (CKiD) study reported new formulae to estimate glomerular filtration rate (eGFR). The study reported here aimed to assess the accuracy of these formulae in estimating levels and changes in GFR in pediatric renal transplant recipients and generate a new formula in our cohort. Methods: Two hundred and fifty-two studies of plasma disappearance of 125I-iothalamate (CIO) were used to measure GFR in 155 renal transplant recipients. The CKiD bedside formula (CKiD-BS) was compared with CIO. A mixed logistic regression model was fit to evaluate the performance of estimating change in posttransplant CIO using CKiD-BS. We used mixed-effects linear regression to fit a multiplicative model of CIO. The CKiD cystatin-C-based formula (CKiD-Cys) was also used for comparison in 32 additional transplant recipients. Comparisons were made using Bland-Altman plots. Results: CKiD-BS underestimates CIO by 20 % for GFR >25 ml/min per 1.73 m2. Percentage change in CKiD-BS performed reasonably well in estimating 15 % change of C IO beginning 6 months posttransplant [area under the curve (AUC) = 0.791)] The multiplicative constant in the CKiD-BS was recalibrated [R-Bedside = 0.461 × ht(cm)/SCr).]A GFR model [GFR-M) = 10.73 × [(ht(cm)]0.51/(SCr)0.90 × (BUN)0.23] has higher specificity but similar sensitivity for CIO compared with R-Bedside. CKiD-Cys overestimates CIO by 10 ml/min per 1.73 m2 across a broad range of GFR. Conclusions: In our cohort, the CKiD-BS underestimates C IO; however, changes in CKiD-BS can be used to estimate changes in CIO. CKiD-Cys overestimates CIO and is not accurate in estimating CIO.

Original languageEnglish (US)
Pages (from-to)445-451
Number of pages7
JournalPediatric Nephrology
Issue number3
StatePublished - Mar 1 2014


  • Glomerular filtration rate
  • I-iothalamate clearance
  • Pediatric kidney transplantation

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Nephrology


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