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1.  Urine Cystatin C as a Biomarker of Proximal Tubular Function Immediately after Kidney Transplantation 
American Journal of Nephrology  2011;33(5):407-413.
Background/Aims
Clinical methods to predict allograft function soon after kidney transplantation are ineffective.
Methods
We analyzed urine cystatin C (CyC) in a prospective multicenter observational cohort study of deceased-donor kidney transplants to determine its peritransplant excretion pattern, utility for predicting delayed graft function (DGF) and association with 3-month graft function. Serial urine samples were collected for 2 days following transplant and analyzed blindly for CyC. We defined DGF as any hemodialysis in the first week after transplant, slow graft function (SGF) as a serum creatinine reduction <70% by the first week and immediate graft function (IGF) as a reduction ≥70%.
Results
Of 91 recipients, 33 had DGF, 34 had SGF and 24 had IGF. Urine CyC/urine creatinine was highest in DGF for all time-points. The area under the curve (95% CI) for predicting DGF at 6 h was 0.69 (0.57–0.81) for urine CyC, 0.74 (0.62–0.86) for urine CyC/urine creatinine and 0.60 (0.45–0.75) for percent change in urine CyC. On the first postoperative day, urine CyC/urine creatinine and percent change in urine CyC were associated with 3-month graft function.
Conclusion
Urine CyC on the day after transplant differs between degrees of perioperative graft function and modestly corresponds with 3-month function.
doi:10.1159/000326753
PMCID: PMC3100377  PMID: 21494031
Transplantation; Biomarkers; Ischemia/reperfusion; Outcomes
2.  Marked variation in the definition and diagnosis of delayed graft function: a systematic review 
Nephrology Dialysis Transplantation  2008;23(9):2995-3003.
Background. The term delayed graft function (DGF) is commonly used to describe the need for dialysis after receiving a kidney transplant. DGF increases morbidity after transplantation, prolongs hospitalization and may lead to premature graft failure. Various definitions of DGF are used in the literature without a uniformly accepted technique to identify DGF.
Methods. We performed a systematic review of the literature to identify all of the different definitions and diagnostic techniques to identify DGF.
Results. We identified 18 unique definitions for DGF and 10 diagnostic techniques to identify DGF.
Conclusions. The utilization of heterogeneous clinical criteria to define DGF has certain limitations. It will lead to delayed and sometimes inaccurate diagnosis of DGF. Hence a diagnostic test that identifies DGF reliably and early is necessary. Heterogeneity, in the definitions used for DGF, hinders the evolution of a diagnostic technique to identify DGF, which requires a gold standard definition. We are in need of a new definition that is uniformly accepted across the kidney transplant community. The new definition will be helpful in promoting better communication among transplant professionals and aids in comparing clinical studies of diagnostic techniques to identify DGF and thus may facilitate clinical trials of interventions for the treatment of DGF.
doi:10.1093/ndt/gfn158
PMCID: PMC2727302  PMID: 18408075
delayed graft function; definition; diagnosis

Results 1-2 (2)