A dual one-way check valve arrangement (300) that may be used for assessing an operating condition of at least one of first and second check valves (304, 308) situated in series along/within a section of a patient-specific section of tubing (244). A pressure sensor (332) may be associated with at least part of the flow path between the first and second check valves (304, 308) and may be operable to provide an indication of a failed condition of at least one of the first and second check valves (304, 308). In one embodiment, the pressure sensor (332) may change from a first state to a second state upon fluid pressure within the flow path between the first and second check valves (304, 308) falling below a predetermined level. For instance, the predetermined level may be a cracking pressure of at least one of the first and second check valves (304, 308). The change in state may be visually discernible on an exterior of the pressure sensor (332).