Systems and methods for monitoring a fluid procedure using hydrostatic pressure

(withdrawn and currently amended) A method for controlling a bodily fluid processing procedure comprising:

• measuring a change in hydrostatic pressure within a fluid circuit to a portion of the fluid circuit between first and second times, wherein
• a container of the fluid circuit having a predetermined or measured initial volume is not in fluid communication with the portion of the fluid circuit at which hydrostatic pressure is being measured at the first time, and
• the container is in fluid communication with the portion of the fluid circuit at which hydrostatic pressure is being measured at the second time;
• determining a volume of the fluid within the container or whether there is fluid communication between the container and the portion of the fluid circuit at which hydrostatic pressure is being measured based on the change in hydrostatic pressure;
• and
• executing a response action when the volume of the fluid within the container is not within an authorized range of volumes having a finite minimum pressure value and a finite maximum pressure value when there is fluid communication between the container and the portion of the fluid circuit at which hydrostatic pressure is being measured that is not authorized, or when there is no fluid communication between the container and the portion of the fluid circuit at which hydrostatic pressure is being measured when fluid communication therebetween is authorized.