This study aims to compare the accuracy of two different blood sampling methods from a central venous catheter (CVC) for measuring anti-Xa activity in children receiving unfractionated heparin (UFH) from this CVC. The results will be compared to a "gold standard" sample taken from an arterial catheter (KTA) whithout UFH. The objective is to identify a more reliable method for monitoring UFH, thereby reducing the risk of bleeding or thrombosis in these patients.
Minors aged 0 to 17 inclusive
Weight greater than or equal to 3.5 kg
Admitted to resuscitation or congenital cardiac intensive care
Requiring treatment with unfractionated heparin at curative doses administered via central venous access
Newborns < 37 weeks gestation
Patients treated by a humanitarian organization