A pump system configured for negative pressure wound therapy, the pump system comprising: a pump assembly configured to provide a negative pressure, via a flow path, to a wound dressing configured to be positioned over a wound, the flow path configured to fluidically connect the pump system to the wound dressing; a sensor configured to measure a pressure in the flow path; and a controller configured to control operation of the pump system, the controller further configured to: measure a first pressure value in the flow path at a first time; measure a second pressure value in the flow path at a second time; calculate a first rate of pressure change using the first and second pressure values; and provide an indication that the wound dressing is full in response to determining that the calculated first rate of pressure change satisfies a threshold rate of change; and characterized in that the controller is further configured to: measure a third pressure value in the flow path at a third time; measure a fourth pressure value within the flow path at a fourth time; calculate a second rate of pressure change using the third and fourth pressure values; and provide the indication that the wound dressing is full in response to determining that the calculated first and second rates of pressure change satisfy the threshold rate of change. a pump assembly configured to provide a negative pressure, via a flow path, to a wound dressing configured to be positioned over a wound, the flow path configured to fluidically connect the pump system to the wound dressing; a sensor configured to measure a pressure in the flow path; and a controller configured to control operation of the pump system, the controller further configured to: measure a first pressure value in the flow path at a first time; measure a second pressure value in the flow path at a second time; calculate a first rate of pressure change using the first and second pressure values; and provide an indication that the wound dressing is full in response to determining that the calculated first rate of pressure change satisfies a threshold rate of change; and characterized in that the controller is further configured to: measure a third pressure value in the flow path at a third time; measure a fourth pressure value within the flow path at a fourth time; calculate a second rate of pressure change using the third and fourth pressure values; and provide the indication that the wound dressing is full in response to determining that the calculated first and second rates of pressure change satisfy the threshold rate of change. measure a first pressure value in the flow path at a first time; measure a second pressure value in the flow path at a second time; calculate a first rate of pressure change using the first and second pressure values; and provide an indication that the wound dressing is full in response to determining that the calculated first rate of pressure change satisfies a threshold rate of change; and characterized in that the controller is further configured to: measure a third pressure value in the flow path at a third time; measure a fourth pressure value within the flow path at a fourth time; calculate a second rate of pressure change using the third and fourth pressure values; and provide the indication that the wound dressing is full in response to determining that the calculated first and second rates of pressure change satisfy the threshold rate of change. measure a third pressure value in the flow path at a third time; measure a fourth pressure value within the flow path at a fourth time; calculate a second rate of pressure change using the third and fourth pressure values; and provide the indication that the wound dressing is full in response to determining that the calculated first and second rates of pressure change satisfy the threshold rate of change.