Method for assessing a patient's fluid status and/or sensitivity to fluid removal, controller, and devices

A blood treatment system for treating the blood of a patient, comprising:

• an obtaining system for obtaining a first value reflecting the distribution of fluid between at least a first and a second distribution space of the patient;
• and,
• a control system,
• wherein the control system determines whether said first value fulfils at least one criterion.

A method for treating blood with a blood treatment system having an obtaining system and a control system, the blood treatment system being configured to assess a patient's fluid status and/or sensitivity to fluid removal from his vascular system or fluid replacement or addition with regard to the patient's hydration state, the method comprising the steps of:

• obtaining a first value reflecting the distribution of a fluid between at least a first and a second distribution space of the body of the patient, or reflecting changes of the distribution of the fluid between at least a first and a second distribution space or reflecting changes of the distribution spaces, from one or more measured or calculated values, figures or terms;
• and,
• assessing whether the first value fulfils at least one criterion,
• wherein the obtaining system obtains said first value and the control system assesses whether the first value fulfils the at least one criterion.