Reference intervals of citrated-native whole blood thromboelastography in premature neonates.

BACKGROUND: Bleeding due to acquired coagulation disorders is a common complication in premature neonates. In this clinical setting, standard coagulation laboratory tests might be unsuitable to investigate the hemostatic function as they reflect the concentration of pro-coagulant proteins but not of anti-coagulant proteins. Thromboelastography (TEG), providing a more complete assessment of hemostasis, may be able to overcome some of these limitations. Unfortunately, experience on the use of TEG in premature neonates is very limited and, in particular in this population, reference ranges of TEG parameters have not been yet evaluated.

AIMS: To evaluate TEG in preterm neonates, and to assess their reference ranges.

METHODS: One hundred and eighteen preterm neonates were analyzed for TEG in a retrospective cohort study. Double-sided 95% reference intervals were calculated using a bootstrap method after Box-Cox transformation. TEG parameters were compared between early-preterm and moderate-/late-preterm neonates and between bleeding and non-bleeding preterm neonates.

RESULTS: Comparing early-preterm with moderate-/late-preterm neonates, TEG parameters were not statistically different, except for fibrinolysis which was significantly higher in early preterm neonates. Platelet count significantly correlated with α angle and MA parameters. Bleeding and non-bleeding neonates had similar TEG values.

CONCLUSIONS: These results reinforce the concept that in stable preterm neonates, in spite of lower concentration of pro- and anti-coagulants proteins, the hemostasis is normally balanced and well functioning.