The purpose of this study is to evaluate the INR value of hemodialyzed patient coagulation state (prothrombin time) measured inside the therapeutical zone and thanks to a portable monitor. The values obtained at the point of care will be compared to the standard biological assessment.

Inclusion Criteria:

• Age > 18
• Haemodialyzed patient whose INR needs to be monitored
• Patient not objecting to participate in the study

The population of the study is the patients under haemodialysis treatment, who need INR monitoring