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Published on: March 17, 2010

[Usefulness of serum cystatin C for the diagnosis of impaired renal function]

Chinami Oyabu1, Nobuhide Hayashi, Daisuke Sugiyama

  • 1Department of Clinical Laboratory, Kobe University Hospital, Kobe.

Rinsho Byori. the Japanese Journal of Clinical Pathology
|February 3, 2007
PubMed

Insights

Serum cystatin C is a more effective marker than serum creatinine for detecting early kidney dysfunction. This study found cystatin C better reflects glomerular filtration rate (GFR) in patients with renal diseases.

Area of Science:

  • Nephrology
  • Clinical Chemistry
  • Biomarker Discovery

Background:

  • Creatinine clearance (Ccr) is the standard clinical measure for glomerular filtration rate (GFR).
  • Emerging evidence suggests serum cystatin C may serve as a more sensitive indicator of GFR.
  • Early detection of renal dysfunction is crucial for patient outcomes.

Purpose of the Study:

  • To compare the efficacy of serum cystatin C, serum creatinine, and serum beta2-microglobulin in reflecting GFR.
  • To evaluate the utility of these markers in identifying early renal dysfunction.
  • To determine the superior marker for GFR assessment in patients with kidney disease.

Main Methods:

  • Cross-sectional study involving 70 patients with diagnosed renal diseases.
  • Measurement of serum cystatin C, serum creatinine, and serum beta2-microglobulin levels.
  • Calculation of creatinine clearance (Ccr) as the reference standard for GFR.
  • Statistical analysis including correlation coefficients and Receiver Operating Characteristic (ROC) curve analysis.

Main Results:

  • Serum cystatin C demonstrated a higher correlation with Ccr (r = 0.830) compared to serum creatinine (r = 0.789) and serum beta2-microglobulin (r = 0.732).
  • Elevated serum cystatin C levels were observed in patients with moderate renal impairment (Ccr 51-70 ml/min) compared to those with normal GFR (>91 ml/min).
  • ROC analysis indicated serum cystatin C had the highest area under the curve for detecting a GFR cutoff of 90 ml/min.

Conclusions:

  • Serum cystatin C is a more sensitive and reliable marker than serum creatinine for assessing GFR.
  • Serum cystatin C shows significant potential for the early detection of renal dysfunction.
  • This study supports the clinical utility of serum cystatin C in managing patients with kidney diseases.

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