Objective To investigate the value of RDW for predicting death risk in the patients with acute pancreatitis (AP) and its correlation with the Ret parameters.Methods A total of 164 patients with AP in the emergency surgery of Second Xiangya Hospital of Central South University from March 2015 to May 2015 were selected ,including 151 survival cases and 13 death cases , and other 175 healthy people were selected as the control group.The venous blood was collected for detecting whole blood RDW and Ret parameters by using the Sysmex XN-1000 automatic blood analyzer.The inter-group comparison was performed by Mann-Whitney U and Kruskal-Wallis H tests ;the diagnostic value of RDW for AP death risk was evaluated by receiver operating charac-teristic(ROC) curve and area under curve(AUC).Results The RDW level in the AP death group was[15.7% (14.1% -21.8% )] , which was significantly higher than that of AP survive group [13.3% (12.7% -14.5% )] ,the difference was statistically significant (Z=40.02 ,P<0.05);AUC of RDW ROC curve for diagnosing death risk was 0.835(95% CI:0.786-0.951);With the cutoff val-ue of RDW for diagnosing the AP death risk as ≥14.5% ,the sensitivity was 71.43% (95% CI:41.90% -91.60% )and specificity was 89.40% (95% CI:83.40% -93.80% );the RDW level of AP patients was positively correlated with Ret% ,IFR ,MFR and HFR(r=0.376 ,0.502 ,0.468 ,0.475 ,P<0.01) ,and was negatively correlated with LFR (r= -0.502 ,P<0.01).Conclusion The RDW level is a good indicator for early predicting AP death risk ,its elevated degree is closely correlated with Ret generation.

Objective To establish the reference intervals(RIs) for plasma presepsin in healthy population.Methods The document C28-A3 issued by CLSI was a guideline about how to define,establish,and verify reference intervals in the clinical laboratory.Plasma values were determined with CLEIA for 1 250 healthy adults(aged 20-90 years old),including 624 males and 626 females.The central 95 percentile of RIs were determined using nonparametric statistical methods.Results The presepsin values in elderly population showed a Gaussian distribution and age/sex related changes.The RIs for plasma presepsin in the reference population respective of age(ranged from 20-＜30,30-＜ 60,60-＜ 90 years) were 50-195,47-170,41-142 pg/mL for males and 43-173,44-162,38-137 pg/mL for females respectively.Conclusion The RIs for plasma presepsin were established according to the gender and age groups in the healthy adults,and could provide a reference for the clinical and laboratory.