Cystatin C - an accurate marker of glomerular filtration rate after renal transplantation?

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Abstract
The performance of serum cystatin C as a screening marker of reduced creatinine clearance in renal transplantation was evaluated and compared to serum creatinine. In addition we studied whether cystatin C accurately reflects creatinine clearance over the entire range of transplant function. Serum cystatin C, serum creatinine, and creatinine clearance were measured in 110 adult renal transplant recipients. Cystatin C detected reduced creatinine clearance with the high sensitivity of 95%. Serum cystatin C and serum creatinine did not differ regarding 90 and 95% sensitivity, derived from the receiver-operating characteristics plot. We demonstrated a strong correlation and linear association between 1/cystatin C and creatinine clearance over the entire range of transplant function, equivalent to that of 1/creatinine. In summary, serum cystatin C accurately reflects creatinine clearance over the entire range of transplant function and is as efficacious as serum creatinine to detect reduced creatinine clearance in renal transplant recipients.

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