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Published on: January 7, 2013

Cystatin C improves the detection of mild renal dysfunction in older patients

Shelagh E O'Riordan1, Michelle C Webb, Helen J Stowe

  • 1Department of Health Care of the Older Person, East Kent Hospitals NHS Trust, Kent and Canterbury Hospital, Canterbury CT1 3NG, UK.

Annals of Clinical Biochemistry
|November 25, 2003
PubMed

Insights

Serum cystatin C is a sensitive screening test for kidney dysfunction in older adults. It better identifies mild renal impairment compared to traditional markers like serum creatinine.

Area of Science:

  • Geriatric Medicine
  • Nephrology
  • Biomarkers

Background:

  • Conventional markers of glomerular dysfunction, such as serum creatinine and creatinine clearance, show limitations in older populations.
  • Assessing kidney function in the elderly requires accurate and sensitive diagnostic tools.

Purpose of the Study:

  • To compare the diagnostic accuracy of serum cystatin C against conventional markers for estimating glomerular dysfunction in older patients.
  • To evaluate cystatin C as a novel test for kidney disease in the elderly.

Main Methods:

  • Fifty-three elderly patients (mean age 79.6 years) with diverse medical conditions were studied.
  • Glomerular filtration rate was assessed using (51)Cr-EDTA as the reference method.
  • Regression analyses compared serum cystatin C, serum creatinine, and creatinine clearance against the reference method.

Main Results:

  • Serum cystatin C (R(2) = 0.79) and Cockcroft and Gault calculated clearance (R(2) = 0.83) showed the best correlation with glomerular filtration rate.
  • Serum cystatin C demonstrated superior sensitivity in detecting mild renal impairment compared to serum creatinine.
  • The study predicted that serum cystatin C levels exceed normal limits as glomerular filtration rate falls below 64 mL/min/1.73 m(2), versus 44 mL/min/1.73 m(2) for serum creatinine.

Conclusions:

  • Serum cystatin C serves as a simple and sensitive screening tool for identifying kidney dysfunction in the elderly.
  • Cystatin C offers improved detection of early-stage renal impairment in older adults.
Abstract

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