Is the Chronic Kidney Disease Epidemiology Collaboration four-level race equation better than the cystatin C

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Xin DU1, Lin Liu, Bo Hu

  • 1Department of Nephrology, Nanjing First Hospital Affiliated to Nanjing Medical University, Nanjing, China.

Nephrology (Carlton, Vic.)
|January 20, 2012
PubMed

Insights

The CKD-EPI race equation and cystatin C-based equations showed similar accuracy for estimating GFR in Chinese CKD patients. Cystatin C-based GFR may overestimate results in advanced CKD stages.

Area of Science:

  • Nephrology
  • Biochemistry
  • Medical Imaging

Background:

  • Glomerular filtration rate (GFR) is a key indicator of kidney function.
  • Accurate GFR estimation is crucial for diagnosing and managing chronic kidney disease (CKD).
  • The CKD-EPI 2011 equation is widely used but its performance in diverse populations requires validation.

Purpose of the Study:

  • To assess the accuracy of the CKD-EPI four-level race equation for GFR estimation in Chinese CKD patients.
  • To compare the CKD-EPI equation with cystatin C-based (CysC GFR) and combined cystatin C-serum creatinine (CysC-Scr GFR) equations.
  • To evaluate the performance of these equations across different stages of CKD.

Main Methods:

  • Comparison of estimated GFR (eGFR) from CKD-EPI, CysC GFR, and CysC-Scr GFR equations.
  • Validation against body surface area (BSA) standardized GFR (sGFR) measured by (99m)Tc-DTPA renal dynamic imaging.
  • Study included 111 Chinese patients with CKD stages 1-5.

Main Results:

  • All three eGFR equations showed statistically significant correlation with measured sGFR.
  • The accuracy within 30% of sGFR was 58.6% for CKD-EPI, 56.8% for CysC GFR, and 63.5% for CysC-Scr GFR.
  • CysC GFR showed increased deviation in CKD stages 4 and 5 (P=0.002), while CKD-EPI and CysC-Scr GFR showed no significant deviation.

Conclusions:

  • CKD-EPI GFR, CysC GFR, and CysC-Scr GFR demonstrated similar bias and overall accuracy in the Chinese CKD population.
  • Adding an Asian coefficient to the CKD-EPI equation offered minimal advantage.
  • CysC GFR tended to overestimate GFR in advanced CKD stages (4 and 5).
Abstract

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