ABSTRACT
Objective To explore the regional reference intervals of biomarkers in umbilical blood for diagnosis of early onset bacterial infection in the healthy term newborns .Methods The umbilical blood samples were collected from 1 476 term newborns in our hospital during January 2012 to October 2013 ,of which 1 191 were healthy infants and enrolled in this study .Then the levels of high sensitive c‐reaction protein(hs‐CRP) ,procalcitonin(PCT) ,interleukin(IL)‐6 ,IL‐8 ,platelet(PLT) as well as white blood cell (WBC) were detected in the umbilical blood .These values were analyzed by SAS 9 .0 ,data were described through upper or lower limits or upper limits respectively .Differences among different subgroups were judged through analysis of Kruskal‐Wallis t test or Mann‐Whitney test respectively .Results The upper limits for hs‐CRP was 3 .1 mg/L ,for PCT was 0 .18 ng/mL ,while the refer‐ence interval for IL‐6 was 56 .6(11 .9-133 .2)ng/L ,and IL 8 was 976 .0(111 .7-2 507 .1)ng/L ,PLT was 242 .0(120 .0-339 .0)× 109/L and for WBC was 12 .9(7 .6-19 .3 )× 10 9/L ,and the value of PLT varied from vaginal delivery group to caesarean section group(230 vs .254 ,Z= 4 .301 ,P0 .05) .Otherwise ,compared with the regional reference intervals ,CRP and PCT in early onset neonatal sepsis group increased(P0 .05) .Conclusion The reference intervals of biomarkers in umbilical blood for diagnosis of early onset bacterial infection were established which may make great contribution for early diagnosis of bacterial infection for the newborns .