title: [ROC curve-based evaluation of platelet parameters for predicting delayed renal graft function].
abstract: OBJECTIVE
  To investigate the value of evaluating 5 platelet parameters in predicting delayed graft function (DGF) in patients following kidney transplantation.
  
  
  METHODS
  We retrospectively analyzed the pre- and postoperative (within 2 months) data of 330 renal transplant recipients. The cases with DGF and those without were analyzed to assess the association between relationship between DGF following transplantation and the variations of blood platelet parameters including platelet count (PLT), large platelet ratio (P-LCR), mean platelet volume (MPV), platelet volume distribution width (PDW) and platelet hematocrit (PCT).
  
  
  RESULTS
  The DGF and non-DGF cases were comparable for the platelet parameters before the operation. On postoperative day 7 when the diagnosis of DGF was made, PLT (P<0.05) and PCT (P<0.02) were significantly lower while MPV (P<0.01), PDW (P=0.036) and P-LCR (P=0.01) significantly higher in DGF group than in non-DGF group. The AUCs of P-LCR (0.611±0.047), PDW (0.603±0.048) and MPV (0.762±0.037) were significantly higher than the reference area (P<0.05) with cut-off values of 34.80%, 12.95fl and 11.55fl, respectively. MPV showed a high sensitivity, specificity and Youden index for predicting DFG; PDW and P-LCR had a high sensitivity but a low specificity for predicting DFG with a modest diagnostic value. PLT and PCT, with AUCs of were 0.37 and 0.38, respectively, did not have a predictive value for DGF.
  
  
  CONCLUSIONS
  Significant variations in platelet parameters occur in the event of DGF in renal transplant recipients, and monitoring the postoperative changes in MPV, PDW, and P-LCR can help in early diagnosis and treatment of DGF. MPV has a moderate value (0.7-0.9) in predicting DGF, and a MPV>11.55 fl suggests the risk of DGF.
authors.affiliation: Department of Kidney Transplantation, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China. E-mail: 371071107@qq.com.
authors.forename: Yi-Chen
authors.initials: YC
authors.lastname: Li
authors.forename: Shao-Jie
authors.initials: SJ
authors.lastname: Fu
authors.forename: Li-Xin
authors.initials: LX
authors.lastname: Yu
authors.forename: Lu-Lu
authors.initials: LL
authors.lastname: Xiao
authors.forename: Min
authors.initials: M
authors.lastname: Luo
authors.forename: Yong-Jie
authors.initials: YJ
authors.lastname: Liang
authors.forename: Yan-Lin
authors.initials: YL
authors.lastname: Feng
mesh_terms: D019540:Area Under Curve; D001792:Blood Platelets; D051799:Delayed Graft Function; D006801:Humans; D007668:Kidney / Q000502:physiology*; D007677:Kidney Function Tests; D016030:Kidney Transplantation; D063847:Mean Platelet Volume; D010976:Platelet Count; D011184:Postoperative Period; D012372:ROC Curve; D012189:Retrospective Studies; D012680:Sensitivity and Specificity